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KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously purchased
* Condition: Like new, never taken out of its packaging.
* Commercially available: Discontinued
* Sharpening: Factory
* Marks on blade: None
* Marks on handle: None
* Box: Present
* Scabbard: /
* Manuals, Certificates and Warranties: Present
* Checked and Certified by our in-house laboratory

Coltelleria Collini exclusive - Available in only 33 numbered examples on blade and box

Intended use: collection / EDC / CQD

Type of production: industrial, limited
Blade: Japanese laminated stainless steel (San Mai) with cryogenically hardened 61.5HRC CoS cutting edge; with double concave shank in the strong of the blade
Blade treatment: satin finish
Country of manufacture: Italy
Handle: made of Titanium, machined from solid, with integral Frame Lock system with removable casement and safety made of stainless steel
Blade length: 75mm.
Blade thickness: 6.3mm.
Total length: 180mm.
Weight: 186g.
Clip: stainless steel, reversible, deep pocket type and with tip up port
Notes: tapered Skull Crasher engaged in the tang - Limited and numbered edition of only 33 pieces serialized on the blade and box
Box: cardboard, numbered, with ExtremaRatio and Coltelleria Collini logos

The Ant is the most compact among Extrema Ratio's folding knives. Despite its small size, this model features an extremely sturdy, durable, and reliable structure.

The Ant Rescue, unlike other versions, has a cheek piece in red coloration that allows the operator to more easily locate the knife in case of a fall. This version is equipped with a specific serration that allows cutting ropes and even high-tensile aramid materials. Moreover, this model has a tapered tang that serves as an emergency screwdriver. The Ant Rescue has been developed according to the needs expressed by the "Italian Army Alpine Troops School".

The handle is made of two different elements: the cheek piece crafted from anodized anticorodal aluminum and the hardened steel frame which also serves as the blade lock (Frame Lock System). This mechanism involves a part of the frame bending inward to firmly secure the blade in the open position, enhancing the user's safety during the knife's use.

The tang features a hole for the insertion of a lanyard, and on the right side of the handle, there is a steel clip that allows for concealed carry in the pocket.

The Ant is available in 4 versions with two different types of steel, both provided by Böhler, an Austrian company with which Extrema Ratio has been collaborating for over 20 years, using its highly esteemed materials for the production of its blades.

For the Stone Washed M390 version, Extrema Ratio uses Böhler M390 steel, thermally treated to 61 HRC, which, thanks to a powder metallurgy production process, ensures cutting effectiveness, wear resistance, and oxidation resistance over time.

The blade is sheep foot-shaped and has a small hole on the top part to facilitate opening. Its particular structure, with a straight edge, allows the user to comfortably rest their fingers on the back of the knife and use it with ease.

Type of production: industrial
Blade: in partially serrated stainless steel M390 61HRC
Blade production: Italy
Handle: anodized anticorodal aluminum and steel
Blade length: 70mm.
Blade thickness: 2.2mm.
Closed length: 55mm.
Total length: 127mm.
Balancing: -
Weight: 42g.
Closure: Frame Lock
Clip: removable stainless steel
Sheath: -
Notes:

The Ant is the most compact among Extrema Ratio's folding knives. Despite its small size, this model features an extremely sturdy, durable, and reliable structure.

The handle is made of two different elements: the cheek piece crafted from anodized anticorodal aluminum and the hardened steel frame which also serves as the blade lock (Frame Lock System). This mechanism involves a part of the frame bending inward to firmly secure the blade in the open position, enhancing the user's safety during the knife's use.

The tang features a hole for the insertion of a lanyard, and on the right side of the handle, there is a steel clip that allows for concealed carry in the pocket.

The Ant is available in 4 versions with two different types of steel, both provided by Böhler, an Austrian company with which Extrema Ratio has been collaborating for over 20 years, using its highly esteemed materials for the production of its blades.

For the Stone Washed M390 version, Extrema Ratio uses Böhler M390 steel, thermally treated to 61 HRC, which, thanks to a powder metallurgy production process, ensures cutting effectiveness, wear resistance, and oxidation resistance over time.

The blade is sheep foot-shaped and has a small hole on the top part to facilitate opening. Its particular structure, with a straight edge, allows the user to comfortably rest their fingers on the back of the knife and use it with ease.

Type of production: industrial
Blade: in stainless steel M390 61HRC
Blade production: Italy
Handle: anodized anticorodal aluminum and steel
Blade length: 70mm.
Blade thickness: 2.2mm.
Closed length: 55mm.
Total length: 127mm.
Balancing: -
Weight: 42g.
Closure: Frame Lock
Clip: removable stainless steel
Sheath: -
Notes:

Higo is one of the most beloved models for Rockstead Knives fans around the world, and HIGOⅡX, with a custom Dark Matter Gold (DMG) carbon fiber coating and a titanium back layer, is one more step in the pursuit of perfection. The blade is made of ZDP189 super stainless steel and features a unique convexity with gradually reduced angle (30 degrees at the middle and 24 degrees at the tip). The variable blade angle is the result of Rockstead's long quest for superior sharpness and cutting ability.

Blade: ZDP-189 stainless steel at 66.7HRC
Handle: anodized titanium and Dark Matter Gold carbon fiber
Blade length: 89mm.
Blade thickness: 3.2mm.
Total length: 216mm.
Weight: 138g.
Closure: Frame Lock with SKD11 casement at 61HRC
Clip: made of 402J2 steel at 48HRC
Notes: Accompanied by warranty certificate with full technical specifications

With the Rockstead brand of Ishida Co. of Sakai, Japan, the best industrial knives currently in production are currently marketed.
Created by Katsumi Kitano, who for over 20 years has been producing quality knives so as to have been awarded the highest recognition among artisan knives in Japan, they are exceptional both in cutting capacity, penetration and hold of the thread and in innovation for the materials used and for construction techniques.

Intended use: Collection / Sports

Type of production: Midtech
Country of production: Sakai - Japan
Blade: in Hitachi YXR7 steel at 64HRC
Blade treatment: Black DLC mirror
Handle: A7075 Duralumin with Hv400 hardness anodizing
Blade length: 70mm.
Blade thickness: 3.3mm.
Length closed: 104mm.
Total length: 176mm.
Thick when closed: 11.4mm.
Weight: 74g.
Opening: through ambidextrous pin
Washers: in steel
Closure: FrameLock with wing in SKD11 at 61HRC
Clip: removable, in 420J2 stainless steel of 1mm. with PVD treatment
Packaging: Wooden box with Rockstead logos, certified with serial number and steel hardness test
Notes: -

Blade: stainless steel ZDP-189 to 67.2HRC
Handle: Duralumin A2024 with anodized surface to HV400
Blade length: 73 mm.
Blade Thickness: 3.5 mm.
Overall length: 176 mm.
Weight: 172 g.
Lock: Frame Lock with a swing in SKD11 61HRC
Clip: Steel 402J2 to 48HRC
Notes: Accompanied by a certificate of guarantee with the technical specifications.

KNIFE WITHDRAWN FROM PRIVATE COLLECTION
* Type: Previously Purchased
* Condition: Like new
* Commercially available Discontinued
* Sharpening: Factory
* Marks on blade: None
* Marks on handle: None
* Box: Present
* Scabbard: -
* Manuals, Certificates and Warranties: Present
* Checked and Certified by our in-house laboratory.


The best industrial knives currently in production are marketed under the Rockstead brand. Created by Katsumi Kitano, who has been making quality knives for more than 20 years to the extent that he has been awarded the highest distinction among artisan knife makers in Japan, they prove to be exceptional both in cutting ability, penetration and edge-holding and in the level of innovation for the materials used and construction techniques.

Country of production: Japan
Type of production: midtech
Blade: Hitachi YXR7 steel at 64.8HRC with 3micron HPC coverage and hardness of Hv1800
Handle: Duralumin A2024 with surface anodizing and hardness of Hv400
Blade length: 90mm.
Blade thickness: 3.5mm.
Total length: 215mm.
Weight: 130g.
Closure: Frame Lock with SKD11 casement at 61HRC
Clip: made of 402J2 steel at 48HRC
Notes: Serial number 005 - 2010 knife accompanied by warranty certificate with technical specifications - Model discontinued and no longer commercially available

Knife withdrawn from a private collection - In like new condition - Never regrind - Checked and certified by our in-house Coltelleria Collini laboratory.

The Extrema Ratio Frame Rock is a new knife, based on the Ti-Rock project, a successful frame-lock knife made by Extrema Ratio in 2016 exclusively for Coltelleria Collini.

The Extreme Ratio Frame Rock is characterized by a titanium handle that offers great resistance while being very light. The integrity of the frame-lock system is guaranteed against wear by an easily replaceable hardened steel insert.

Unlike its drop-point predecessor, the Rock frame has a 75mm long, 6.0mm thick spearpoint blade fitted with a fuller for further lightening. The blade is made of Bohler N690 steel, heat treated to a hardness of 58 HRC. The same is available with a black finish with DLC treatment or satin.

To make opening even more fluid and without uncertainty, the blade rotates on ball bearings. This mechanism allows the user to adjust the force necessary to obtain the release of the blade from the closed position.

The shape of the reversible clip allows a hidden port in the pocket, making the knife not visible from the outside. The large and solid handle and the well-proportioned blade allow this knife to tackle heavy tasks. The Frame Rock weighs less than 200g, making it somewhat light for such a sturdy knife. Comes inside an ABS box.

Intended use: collection / CQD

Type of production: industrial,
Blade: N690Co stainless steel
Blade treatment: Satin finish
Country of production: Italy
Handle: Titanium, machined from solid, with integral Frame Lock closure system with removable flap and safety made of stainless steel
Blade length: 75mm.
Blade thickness: 6.3mm.
Total length: 181mm.
Weight: 193g.
Clip: stainless steel, reversible, deep pocket type and with tip up port
Notes: Conical Skull Crasher inserted in the tang
Box: in ABS with Extrema Ratio logos

With the Rockstead brand of Ishida Co. of Sakai, Japan, the best industrial knives currently in production are currently marketed.

Created by Katsumi Kitano, who for over 20 years has been producing quality knives so as to have been awarded the highest recognition among artisan knives in Japan, they are exceptional both in cutting capacity, penetration and tightness of the thread and in innovation for the materials used and for construction techniques.

Intended use: Collection / Sports

Type of production: Midtech
Country of production: Sakai - Japan
Blade: ZDP189 stainless steel hardened to 66.5HRC
Blade treatment: mirror polished
Handle: titanium
Blade length: 90mm.
Blade thickness: 3mm.
Closed length: 120mm.
Total length: 216mm.
Thick when closed: 12.2mm.
Weight: 136g.
Opening: through ambidextrous pin
Washers: in brass
Closure: FrameLock with wing in SKD11 at 61HRC
Clip: removable, in 420J2 stainless steel with PVD treatment
Packaging: Wooden box with Rockstead logos, certified with serial number and steel hardness test
Notes: Serial number # 096 - Date of production 05 July 2019

With the Rockstead brand of Ishida Co. of Sakai, Japan, the best industrial knives currently in production are currently marketed.

Created by Katsumi Kitano, who for over 20 years has been producing quality knives so as to have been awarded the highest recognition among artisan knives in Japan, they are exceptional both in cutting capacity, penetration and hold of the thread and in innovation for the materials used and for construction techniques.

Intended use: Collection / Sports

Type of production: Midtech
Country of production: Sakai - Japan
Blade: ZDP189 stainless steel hardened to 66.4HRC
Blade treatment: mirror polished
Handle: anodised titanium and carbon fiber
Blade length: 89mm.
Blade thickness: 3mm.
Closed length: 120mm.
Total length: 216mm.
Thick when closed: 15.8mm.
Weight: 133g.
Opening: through ambidextrous pin
Washers: in steel
Closure: FrameLock with wing in SKD11 at 61HRC
Clip: removable, in 420J2 stainless steel with PVD treatment
Packaging: Wooden box with Rockstead logos, certified with serial number and steel hardness test
Notes: Serial number # 028 - Date of production April 23, 2019

A Coltelleria Collini Exclusive - Limited edition, available in only 33 serialized pieces

Intended Use: collection / EDC / CQD

Type of production: Industrial, Limited
Blade: Japanese-rolled stainless steel (San Mai) with sharp CoS to 61,5HRC in cryogenic quenching; with fuller double concave in the strong blade
Blade treatment: Satin finish
Production Country: Italy
Handle: Titanium, Billet, with full Frame Lock locking system with sash and secure removable made of stainless steel
Blade length: 75mm.
Blade Thickness: 6.3mm.
Overall length: 180mm.
Weight: 186g.
Clips: stainless steel, reversible type deep pocket and port tip up
Notes: Skull Crasher tapered shank engaged in - Edition limited and numbered edition in only 33 serialized pieces on the blade and box
Box: cardboard, numbered, with ExtremaRatio logos and Coltelleria Collini

A Coltelleria Collini Exclusive - Limited edition, available in only 33 serialized pieces

Intended Use: collection / EDC / CQD

Type of production: Industrial, Limited
Blade: Japanese-rolled stainless steel (San Mai) with sharp CoS to 61,5HRC in cryogenic quenching; with fuller double concave in the strong blade
Blade treatment: Satin finish
Production Country: Italy
Handle: Titanium, Billet, with full Frame Lock locking system with sash and secure removable made of stainless steel
Blade length: 75mm.
Blade Thickness: 6.3mm.
Overall length: 180mm.
Weight: 186g.
Clips: stainless steel, reversible type deep pocket and port tip up
Notes: Skull Crasher tapered shank engaged in - Edition limited and numbered edition in only 33 serialized pieces on the blade and box
Box: cardboard, numbered, with ExtremaRatio logos and Coltelleria Collini

A Coltelleria Collini Exclusive - Limited edition, available in only 33 serialized pieces

Intended Use: collection / EDC / CQD

Type of production: Industrial, Limited
Blade: Japanese-rolled stainless steel (San Mai) with sharp CoS to 61,5HRC in cryogenic quenching; with fuller double concave in the strong blade
Blade treatment: Satin finish
Production Country: Italy
Handle: Titanium, Billet, with full Frame Lock locking system with sash and secure removable made of stainless steel
Blade length: 75mm.
Blade Thickness: 6.3mm.
Overall length: 180mm.
Weight: 186g.
Clips: stainless steel, reversible type deep pocket and port tip up
Notes: Skull Crasher tapered shank engaged in - Edition limited and numbered edition in only 33 serialized pieces on the blade and box
Box: cardboard, numbered, with ExtremaRatio logos and Coltelleria Collini

Collectors Edition with:

* Box of ABS branded laser
* Tactical Kydex scabbard and leather, handcrafted
* Attack Tek-Lok
* Lanyard black paracord with custom anodized titanium wire stop with slogans and Extrema Ratio Knives Collini

Only two specimens at our disposal: Number 4 of 100 and number 9 of 100

This is a Collini Cutlery Exclusive - Only available in 100 serialized pieces

Intended Use: collection / EDC / CQD
Type of production: industrial, Limited
Blade: N690 stainless steel in 58HRC with hollow ground fuller
Blade Treatment: Black Testudo
Blade Production: Italy
Handle: Titanium machined from solid.
Closing system: Frame Lock with swing and safe removable stainless steel
Blade length: 75mm.
Blade Thickness: 6.3mm.
Overall length: 180mm.
Weight: 190g.
Clips: stainless steel, reversible, deep pocket, tip up
Notes: Conical Skull Crasher engaged in the shank - Limited and serialized edition in only 100 pieces
Box: Cardboard, serialized, with Extrema Ratio and Coltelleria Collini logos

Con il marchio Rockstead, della Ishida Co. di Sakai, in Giappone, sono attualmente commercializzati i migliori coltelli industriali attualmente in produzione.

Creati da Katsumi Kitano, che da oltre 20 anni produce coltelli di qualità tanto da esser stato insignito del massimo riconoscimento tra i coltellinai artigiani in Giappone, si dimostrano eccezionali sia in capacità di taglio, penetrazione e tenuta del filo sia a livello di innovazione per i materiali utilizzati e per le tecniche costruttive.

Lama: acciaio laminato con guance esterne in VG10 e tagliente in ZDP-189 a 66/67HRC con finitura a specchio
Manicatura: Titanio anodizzato
Lunghezza lama: 105 mm.
Spessore della lama: 3,8 mm.
Lunghezza totale: 190 mm.
Peso: 159g.
Chiusura: Frame Lock con battente in acciaio inox
Clip: Deep pocket, amovibile, in acciaio inox SUS420J2 a 50HRC
Note: Design by Sinkevich - accompagnato da certificato di garanzia con specifiche tecniche dettagliate

** SOLD OUT - OUT OF STOCK AND OUT OF PRODUCTION ** 

This is a Collini Cutlery Exclusive - Only available in 100 serialized pieces

Intended Use: collection / EDC / CQD
Type of production: industrial, Limited
Blade: N690 stainless steel in 58HRC with hollow ground fuller
Blade Treatment: Black Testudo
Blade Production: Italy
Handle: Titanium machined from solid.
Closing system: Frame Lock with swing and safe removable stainless steel
Blade length: 75mm.
Blade Thickness: 6.3mm.
Overall length: 180mm.
Weight: 190g.
Clips: stainless steel, reversible, deep pocket, tip up
Notes: Conical Skull Crasher engaged in the shank - Limited and serialized edition in only 100 pieces
Box: Cardboard, serialized, with Extrema Ratio and Coltelleria Collini logos

Rockstead - Higo-X-IW - Ironwood ZDP-189 - knife

With the brand Rockstead, Ishida Co. in Sakai, Japan, are currently marketed the best industrial knives currently in production.

Created by Katsumi Kitano, who for over 20 years has been producing quality knives so as to have been awarded the highest honor among the artisan knife makers in Japan, proved to be exceptional in cutting capacity, penetration and sealing wire is at the level of innovation for materials and construction techniques.

Blade: ZDP-189 in 66.8HRC
Handle material: stainless steel and wood SUS420J2 Ironwood
Blade length: 90 mm.
Blade Thickness: 3 mm.
Overall length: 215 mm.
Weight: 133g.
Lock: Frame Lock with swing SKD11 to 61HRC
Clip: 402J2 steel at 48HRC
Notes: Accompanied by a certificate of guarantee with the technical specifications.

Blade: Hitachi YXR7 64.8HRC steel with 3micron HPC cover - Hv1800
Handle: Duralumin A2024 with surface anodization at Hv400
Blade length: 90 mm.
Blade thickness: 3.5 mm.
Overall length: 215 mm.
Weight: 100 g.
Closing: Frame Lock with SKD11 to 61HRC
Clip: 402J2 steel to 48HRC
Notes: Accompanied by a certificate of guarantee with technical specifications.

Intended use: Collection / Sports

Type of production: Midtech
Country of production: Sakai - Japan
Blade: ZDP189 stainless steel hardened to 66.4HRC
Blade treatment: mirror polished
Handle: aluminum
Blade length: 90mm.
Blade thickness: 3mm.
Closed length: 120mm.
Total length: 216mm.
Thick when closed: 15.8mm.
Weight: 102g.
Opening: through ambidextrous pin
Washers: in steel
Closure: FrameLock with wing in SKD11 at 61HRC
Clip: removable, in 420J2 stainless steel with PVD treatment
Packaging: Wooden box with Rockstead logos, certified with serial number and steel hardness test
Notes: Serial number # 1039 - Date of production 31 May 2019