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Welcome to the website of Collini Cutlery in Italy

Extrema Ratio

Extrema Ratio

Extrema Ratio, located in Prato, Italy, has been designing, manufacturing and selling high performance combat knives since 1997 enjoying a reputation for excellence that is unsurpassed in the military and tactical knife industry.

The increased capacity through the years enabled Extrema Ratio to extend its operations. As part of this effort, the company moved in 2004 to a new 600 square meter facility in order to meet the market demand and the company quickly established itself as one of the country's leading cutlery manufacturers.

Extrema Ratio serves military and law enforcement communities as well as commercial markets and the knives are well known and sought after all over the globe.

The company prides itself in design, material and quality to deliver a high end product that meets the most severe mil-standards.

The production based on modern cutting edge technology is combined with traditional craftsmanship and the result is the pinnacle of this synthesis. The Extrema Ratio design team uses the 3D system to design new models and create prototypes. Each knife design is then meticulously inspected and then field tested. At this point the finest materials are chosen for durability, function and beauty. Each knife is then hand assembled and hand finished and inspected by Extrema Ratio team of craftsmen.

First class handwork and well-selected material have contributed to form the image of the Extrema Ratio trademark all over the world.

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  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Task J - Jagdkommando - knife

    Excl. Tax: €300.82 Incl. Tax: €367.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kitchen Talon 8cm - Steak anb table knife

    Excl. Tax: €40.98 Incl. Tax: €50.00

    Article code: k-talon

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Ti-Rock Satin SanMai CoS - Titanium Blue - Limited Edition - folding knife

    Excl. Tax: €360.65 Incl. Tax: €439.99

    Article code: TIROCK-C-BL

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Ti-Rock Satin SanMai CoS - Titanium Black - Limited Edition - folding knife

    Excl. Tax: €360.65 Incl. Tax: €439.99

    Article code: TIROCK-C-BK

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Packaging 6 pieces Sector 1 table knife 4cm - Table knife

    Excl. Tax: €221.31 Incl. Tax: €270.00

    Article code: set-sect1

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Packaging 6 pieces Sector 2 table knife 7cm - Table knife

    Excl. Tax: €226.23 Incl. Tax: €276.00

    Article code: set-sect2

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Ti-Rock Satin sanmai CoS - Titanium Grey - Limited Edition - folding knife

    Excl. Tax: €360.65 Incl. Tax: €439.99

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Sector 2 table knife 7cm - Table knife

    Excl. Tax: €40.98 Incl. Tax: €50.00

    Article code: sector2

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Sector 1 table knife 4cm - Table knife

    Excl. Tax: €40.16 Incl. Tax: €49.00

    Article code: sector1

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - set 6 pcs Kitchen Talon knife 8cm - Table knives

    Excl. Tax: €226.23 Incl. Tax: €276.00

    Article code: set-talon

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0CD - Stone Washed - knife

    Excl. Tax: €64.75 Incl. Tax: €79.00

    Article code: 12645

  • ExtremaRatio - Selvans Desert + Survival Kit coltello machete

    ExtremaRatio - Selvans Desert + Survival Kit - survival knife

    Excl. Tax: €522.95 Incl. Tax: €638.00

    Article code: 4355SD

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Satin in San Mai CoS - knife

    Excl. Tax: €245.08 Incl. Tax: €299.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Karambit Black - Neck Knife - NK3K - knife

    Excl. Tax: €139.34 Incl. Tax: €169.99

    Article code: 12634

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Karambit Stone Washed - Neck Knife - NK3K - knife

    Excl. Tax: €131.97 Incl. Tax: €161.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Karambit Desert Warfare - Neck Knife - NK3K - knife

    Excl. Tax: €142.62 Incl. Tax: €174.00

    Article code: 12636

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Ti-Rock Tactical Version - Limited Edition - knife

    Excl. Tax: €450.00 Incl. Tax: €549.00

    Notify when available

    Article code: Ti-Rock-Collector

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - Nightmare Karambit - Black - folding knife

    Excl. Tax: €213.93 Incl. Tax: €260.99

    Article code: 12621

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - Nightmare Karambit - Stone Washed - folding knife

    Excl. Tax: €200.82 Incl. Tax: €245.00

    Article code: 12622

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 T Tanto Black - folding knife

    Excl. Tax: €287.70 Incl. Tax: €350.99

    Article code: ER-HF1T

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 D Drop Black - folding knife

    Excl. Tax: €287.70 Incl. Tax: €350.99

    Article code: ER-HF1D

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2T Tanto Black - folding knife

    Excl. Tax: €297.54 Incl. Tax: €363.00

    Article code: 12614T

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2D Drop Black - folding knife

    Excl. Tax: €297.54 Incl. Tax: €363.00

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - MF0T Tanto Black - folding knife

    Excl. Tax: €225.41 Incl. Tax: €275.00

  • ExtremaRatio - Resolza S Black - folding knife

    ExtremaRatio - Resolza S Black - folding knife

    Excl. Tax: €123.77 Incl. Tax: €151.00

  • ExtremaRatio - Resolza L Black - folding knife

    ExtremaRatio - Resolza L Black - folding knife

    Excl. Tax: €186.07 Incl. Tax: €227.01

    Article code: 12079L

  • ExtremaRatio - Resolza S Satin - folding knife

    ExtremaRatio - Resolza S Satin - folding knife

    Excl. Tax: €120.49 Incl. Tax: €147.00

    Article code: 12589

  • ExtremaRatio - Resolza L Satin - folding knife

    ExtremaRatio - Resolza L Satin - folding knife

    Excl. Tax: €176.23 Incl. Tax: €215.00

    Article code: 12078L

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Full Handle - Black - knife

    Excl. Tax: €181.97 Incl. Tax: €222.00

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Fulcrum C FH - Full Handle - Black - knife

    Excl. Tax: €189.34 Incl. Tax: €230.99

    Article code: 12555

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    Extrema Ratio - Corvo Black - tactical knife

    Excl. Tax: €234.43 Incl. Tax: €286.00

    Article code: 12525

  • ExtremaRatio - Culter Venatorius - Limited Edition 300pz - coltello

    ExtremaRatio - Culter Venatorius - Limited Edition - Hunting Knife

    Excl. Tax: €889.75 Incl. Tax: €1,085.50

  • Victorinox - Fodero in pelle 4.0523.3

    ExtremaRatio - coupling Belt Clip Tek-Lok - Knife Accessories

    Excl. Tax: €16.39 Incl. Tax: €20.00

    Article code: ER-TEKLOK

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Ti-Rock Tactical Version - Limited Edition - knife

    Excl. Tax: €323.77 Incl. Tax: €395.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.2 Stone Washed - Neck Knife - NK2

    Excl. Tax: €101.64 Incl. Tax: €124.00

    Article code: 12448

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.2 Black - Neck Knife - NK2

    Excl. Tax: €109.02 Incl. Tax: €133.00

    Article code: 12449

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Stone Washed - Neck Knife - NK3 - knife

    Excl. Tax: €120.49 Incl. Tax: €147.00

    Article code: 12450

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Black - Neck Knife - NK3 - knife

    Excl. Tax: €127.87 Incl. Tax: €156.00

    Article code: 12451

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.3 Desert Warfare - Neck Knife - NK3 - knife

    Excl. Tax: €131.97 Incl. Tax: €161.00

    Article code: 12468

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 S Testudo - knife

    Excl. Tax: €218.03 Incl. Tax: €266.00

    Article code: 12437

  • ExtremaRatio - MF3D BC - Ingredior Drop coltello extrema ratio

    ExtremaRatio - MF3D - Ingredior Drop Testudo - knife

    Excl. Tax: €291.80 Incl. Tax: €356.00

  • ExtremaRatio - Dobermann IV - Tactical Testudo - coltello, cuchillo, knife

    ExtremaRatio - Dobermann IV - Africa - knife

    Excl. Tax: €476.23 Incl. Tax: €581.00

  • ExtremaRatio - Dobermann IV - Tactical Testudo - coltello, cuchillo, knife

    ExtremaRatio - Dobermann IV S - Africa - knife

    Excl. Tax: €472.95 Incl. Tax: €577.00

  • ExtremaRatio - A.S.F.K. Comando delle Forze Speciali dell'Esercito - ASFK - coltello

    ExtremaRatio - A.S.F.K. Italian Army Special Forces Commando - ASFK - knife

    Excl. Tax: €288.52 Incl. Tax: €351.99

    Article code: 12408

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 C Testudo - knife

    Excl. Tax: €186.07 Incl. Tax: €227.01

    Article code: 12381

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Waki Desert Warfare ​​30cm. - Roast Knife

    Excl. Tax: €282.79 Incl. Tax: €345.00

  • ExtremaRatio - Dobermann IV - Tactical Testudo - coltello, cuchillo, knife

    ExtremaRatio - Dobermann IV - Classic Satin - knife

    Excl. Tax: €336.07 Incl. Tax: €410.01

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Waki ​​30cm. - Roast Knife

    Excl. Tax: €354.92 Incl. Tax: €433.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho 15cm. - Chef's knife

    Excl. Tax: €275.41 Incl. Tax: €336.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho Desert Warfare 19cm. - Chef's knife

    Excl. Tax: €216.39 Incl. Tax: €264.00

    Article code: 12322

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kato 15cm. - Santoku Knife

    Excl. Tax: €293.44 Incl. Tax: €358.00

    Article code: 12323

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kato Desert Warfare 15cm. - Santoku Knife

    Excl. Tax: €193.44 Incl. Tax: €236.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho Desert Camo 15cm. - Chef's knife

    Excl. Tax: €200.00 Incl. Tax: €244.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho 19cm. - Chef's knife

    Excl. Tax: €302.46 Incl. Tax: €369.00

  • ExtremaRatio - T-Razor Testudo - knife

    ExtremaRatio - T-Razor Testudo - knife

    Excl. Tax: €172.95 Incl. Tax: €211.00

    Article code: 12259

  • ExtremaRatio - T-Razor - knife

    ExtremaRatio - T-Razor - knife

    Excl. Tax: €186.89 Incl. Tax: €228.01

    Article code: 12260

  • ExtremaRatio - MF1 Desert Warfare - coltello chiudibile

    ExtremaRatio - MF1 Desert Warfare - coltello chiudibile

    Excl. Tax: €263.93 Incl. Tax: €321.99

  • ExtremaRatio - Fulcrum S Testudo coltello, knives, messer, cuchillo

    ExtremaRatio - Fulcrum S Testudo - Coltello

    Excl. Tax: €263.11 Incl. Tax: €320.99

    Article code: 4252

  • ExtremaRatio - Fulcrum Nibbio - Esercito Italiano - Testudo - coltello

    ExtremaRatio - Fulcrum Civil Bayonet - Testudo - knife

    Excl. Tax: €360.66 Incl. Tax: €440.01

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR - Karambit Collector's Edition - knife

    Excl. Tax: €270.49 Incl. Tax: €330.00

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR Testudo - Karambit Limited Edition - knife

    Excl. Tax: €286.89 Incl. Tax: €350.01

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1TK Folder - Training Knife

    Excl. Tax: €73.77 Incl. Tax: €90.00

    Article code: 12226

  • ExtremaRatio - Resolza Stone Washed - knife pattada

    ExtremaRatio - Resolza Stone Washed - knife pattada

    Excl. Tax: €156.56 Incl. Tax: €191.00

    Article code: 12078

  • ExtremaRatio - Resolza Testudo - knife pattada

    ExtremaRatio - Resolza Testudo - knife pattada

    Excl. Tax: €167.21 Incl. Tax: €204.00

    Article code: 12079

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR - Karambit Limited Edition - knife

    Excl. Tax: €192.62 Incl. Tax: €235.00

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR Testudo - Karambit Limited Edition - knife

    Excl. Tax: €204.92 Incl. Tax: €250.00

  • Extrema Ratio - Skar

    ExtremaRatio - TK SKAR Training Karambit aluminum - knife

    Excl. Tax: €32.79 Incl. Tax: €40.00

    Article code: TK-SKAR

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mato Grosso - Machete - Knife

    Excl. Tax: €271.31 Incl. Tax: €331.00

  • Victorinox - Fodero in pelle 4.0523.3

    ExtremaRatio - coupling - under shirt - for NK1, NK2 and NK3 models

    Excl. Tax: €16.39 Incl. Tax: €20.00

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.1 Desert Warfare - Neck Knife

    Excl. Tax: €109.84 Incl. Tax: €134.00

    Article code: 12000

  • ExtremaRatio - BF2V - Sailing Knife

    ExtremaRatio - BF2V - Sailing Knife

    Excl. Tax: €157.38 Incl. Tax: €192.00

    Article code: 10888

  • ExtremaRatio - BF2CD - Drop Point - knife

    ExtremaRatio - BF2CD - Drop Point - knife

    Excl. Tax: €144.26 Incl. Tax: €176.00

    Article code: 4225

  • ExtremaRatio - BF2CD Desert Warfare Drop Point

    ExtremaRatio - BF2CD Desert Warfare Drop Point - coltello

    Excl. Tax: €163.93 Incl. Tax: €199.99

  • ExtremaRatio - BF2CT Desert Warfare Tanto Point - coltello

    ExtremaRatio - BF2CT Desert Warfare Tanto Point - coltello

    Excl. Tax: €163.93 Incl. Tax: €199.99

    Article code: 4356T

  • ExtremaRatio - BF2CT  - Classic Tanto - tactical knife

    ExtremaRatio - BF2CT - Classic Tanto - tactical knife

    Excl. Tax: €144.26 Incl. Tax: €176.00

    Article code: 10886

  • ExtremaRatio - Nemesis - coltello

    ExtremaRatio - Nemesis - coltello

    Excl. Tax: €335.25 Incl. Tax: €409.01

  • ExtremaRatio - Selvans Green + Survival Kit - knife

    ExtremaRatio - Selvans Green + Survival Kit - knife

    Excl. Tax: €436.89 Incl. Tax: €533.01

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - RAO II - knife

    Excl. Tax: €288.52 Incl. Tax: €351.99

    Article code: 10167

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.1 Testudo - Neck Knife

    Excl. Tax: €104.10 Incl. Tax: €127.00

    Article code: 10181

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.1 Stone Washed - Neck Knife

    Excl. Tax: €95.08 Incl. Tax: €116.00

    Article code: 10802

  • Leatherman - Wave - pinza multiuso

    ExtremaRatio - TK Tool 2.0 Testudo - Multitool

    Excl. Tax: €39.34 Incl. Tax: €47.99

  • Leatherman - Wave - pinza multiuso

    ExtremaRatio - TK Tool 2.0 Testudo - Multitool

    Excl. Tax: €53.28 Incl. Tax: €65.00

    Article code: 10154

  • /

    ExtremaRatio - Police Evo - Multitool - knife

    Excl. Tax: €386.07 Incl. Tax: €471.01

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kreios - Heavy Utility Machete - Knife

    Excl. Tax: €342.62 Incl. Tax: €418.00

  • ExtremaRatio - S.E.R.E.1 - coltello - Extrema Ratio Sere 1

    ExtremaRatio - S.E.R.E. 1 - Sere Knife

    Excl. Tax: €290.98 Incl. Tax: €355.00

    Article code: 10029

  • ExtremaRatio - Dicok Diving Compact Knife - coltello da sub

    ExtremaRatio-Dicok Compact Diving Knife-divers knife

    Excl. Tax: €157.38 Incl. Tax: €192.00

    Article code: 10006

  • ExtremaRatio - Dobermann IV - Tactical Testudo - coltello, cuchillo, knife

    ExtremaRatio - Dobermann IV - Tactical Testudo - knife

    Excl. Tax: €276.23 Incl. Tax: €337.00

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185° RAO - knife

    Excl. Tax: €288.52 Incl. Tax: €351.99

    Article code: 4247

  • ExtremaRatio - 185° RAO AVIO - knife

    ExtremaRatio - 185° RAO AVIO - knife

    Excl. Tax: €371.31 Incl. Tax: €453.00

    Article code: 4247I

  • Extremaratio - Col Moschin - Testudo - coltello

    Extremaratio - Col Moschin - Testudo - knife

    Excl. Tax: €288.52 Incl. Tax: €351.99

    Article code: 4140

  • ExtremaRatio - MPC

    ExtremaRatio - MPC - Coltello

    Excl. Tax: €360.66 Incl. Tax: €440.01

  • Extremaratio - Venom

    Extremaratio - Venom - Testudo - coltello

    Excl. Tax: €268.03 Incl. Tax: €327.00

  • ExtremaRatio - Pugio Testudo Filo Singolo - knife

    ExtremaRatio - Pugio Testudo Filo Singolo - knife

    Excl. Tax: €238.52 Incl. Tax: €290.99

    Article code: 4366

  • ExtremaRatio - Task C Testudo - Coltello

    ExtremaRatio - Task C Testudo - knife

    Excl. Tax: €155.74 Incl. Tax: €190.00

  • ExtremaRatio - Task Testudo - Coltello

    ExtremaRatio - Task Testudo - knife

    Excl. Tax: €222.13 Incl. Tax: €271.00

    Article code: 4370

  • ExtremaRatio - Lamborghini Reventón - Limited Edition - coltello

    ExtremaRatio - Lamborghini Reventon - Limited Edition - knife

    Excl. Tax: €409.02 Incl. Tax: €499.00

  • ExtremaRatio - Glauca B1 G.I.G.N

    ExtremaRatio - Glauca B1 G.I.G.N. knife

    Excl. Tax: €405.74 Incl. Tax: €495.00

  • ExtremaRatio - Kukri KS - Testudo - coltello

    ExtremaRatio - Kukri KS - Testudo - coltello

    Excl. Tax: €284.43 Incl. Tax: €347.00

    Article code: 4187

  • Extremaratio - MK2.1 - Desert Warfare - coltello

    Extremaratio - MK2.1 - Desert Warfare - knife

    Excl. Tax: €326.23 Incl. Tax: €398.00

  • ExtremaRatio - Rasoio da barba Fusion con Pennello in Tasso - idea regalo

    ExtremaRatio - Rasoio da barba Fusion con Pennello in Tasso - idea regalo

    Excl. Tax: €635.25 Incl. Tax: €775.01

    Article code: 4190B

Items 1 to 100 of 147 total

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