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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.

Items 1 to 100 of 155 total

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  • Extremaratio - A.M.F. Advanced Multi Function Black - AMF - knife

    Extremaratio - A.M.F. Advanced Multi Function Black - AMF - knife

    €304.92
    Available from late June

    Article code: ER-AMFBL

  • Extremaratio - A.M.F. Advanced Multi Function Desert - AMF - knife

    Extremaratio - A.M.F. Advanced Multi Function Desert - AMF - knife

    €299.18
    Available from late June

    Article code: ER-AMFDE

  • ExtremaRatio - Kukri KS - Testudo - coltello

    ExtremaRatio - KH Black - Kukri Machete - knife

    €350.00

    Article code: ER-KHB

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout Black - knife

    €159.02

    Article code: 12656

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Black - knife

    €162.30

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout Satin - knife

    €137.71

    Article code: 12657

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Satin - knife

    €141.80

  • ExtremaRatio - Glauca B1 G.I.G.N

    ExtremaRatio - Glauca J1 Jagdkommando - knife

    €407.38

    Article code: ER-GLAJ1

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185 ° RAO in Sanmai Japanese steel - knife

    €368.85
    available at the end of june
  • ExtremaRatio - set da barba - shaving kit - pennello e rasoio

    ExtremaRatio - shaving kit - brush and razor

    €635.24

    Article code: ER-SHAVING

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Task J - Jagdkommando - knife

    €300.82

    Article code: ER-TASKJ

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kitchen Talon 8cm - Steak anb table knife

    €40.98

    Article code: k-talon

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €360.65

    Article code: TIROCK-C-BL

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €360.65

    Article code: TIROCK-C-BK

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €221.31

    Article code: set-sect1

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €226.23

    Article code: set-sect2

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €360.65
    prodotto terminato
  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Sector 2 table knife 7cm - Table knife

    €40.98

    Article code: sector2

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Sector 1 table knife 4cm - Table knife

    €40.16

    Article code: sector1

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €226.23

    Article code: set-talon

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0CD - Stone Washed - knife

    €64.75

    Article code: 12645

  • ExtremaRatio - Selvans Desert + Survival Kit coltello machete

    ExtremaRatio - Selvans Desert + Survival Kit - survival knife

    €522.95
    available in about 10/15 days

    Article code: 4355SD

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Satin in San Mai CoS - knife

    €245.08
    disponibilità prevista: giugno 2017
  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €139.34

    Article code: 12634

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €131.97

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €142.62

    Article code: 12636

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €450.00
    DISCONTINUED

    Notify when available

    Article code: Ti-Rock-Collector

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - Nightmare Karambit - Black - folding knife

    €213.93

    Article code: 12621

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - Nightmare Karambit - Stone Washed - folding knife

    €200.82

    Article code: 12622

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 T Tanto Black - folding knife

    €287.70

    Article code: ER-HF1T

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 D Drop Black - folding knife

    €287.70

    Article code: ER-HF1D

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2T Tanto Black - folding knife

    €297.54

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2D Drop Black - folding knife

    €297.54
    available in about 10/15 days
  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - MF0T Tanto Black - folding knife

    €225.41
    available in about 10/15 days

    Article code: 12596

  • ExtremaRatio - Resolza S Black - folding knife

    ExtremaRatio - Resolza S Black - folding knife

    €123.77

    Article code: 12079S

  • ExtremaRatio - Resolza L Black - folding knife

    ExtremaRatio - Resolza L Black - folding knife

    €186.07

    Article code: 12079L

  • ExtremaRatio - Resolza S Satin - folding knife

    ExtremaRatio - Resolza S Satin - folding knife

    €120.49
    available in about 10/15 days

    Article code: 12589

  • ExtremaRatio - Resolza L Satin - folding knife

    ExtremaRatio - Resolza L Satin - folding knife

    €176.23

    Article code: 12078L

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Full Handle - Black - knife

    €181.97
    available in about 10/15 days

    Article code: 12553

  • ExtremaRatio - Shrapnel OG Testudo - coltello

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

    €189.34

    Article code: 12555

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    Extrema Ratio - Corvo Black - tactical knife

    €234.43

    Article code: 12525

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

    ExtremaRatio - Culter Venatorius - Limited Edition - Hunting Knife

    €889.75

  • Victorinox - Fodero in pelle 4.0523.3

    ExtremaRatio - coupling Belt Clip Tek-Lok - Knife Accessories

    €16.39

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €323.77

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €101.64

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €109.02

    Article code: 12449

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €120.49

    Article code: 12450

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €127.87

    Article code: 12451

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €131.97

    Article code: 12468

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 S Testudo - knife

    €218.03

    Article code: 12437

  • ExtremaRatio - MF3D BC - Ingredior Drop coltello extrema ratio

    ExtremaRatio - MF3D - Ingredior Drop Testudo - knife

    €291.80
    available in about 10/15 days

    Article code: 4358D

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

    ExtremaRatio - Dobermann IV - Africa - knife

    €476.23

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

    ExtremaRatio - Dobermann IV S - Africa - knife

    €472.95

    Article code: 12384S

  • 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

    €288.52

    Article code: 12408

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 C Testudo - knife

    €186.07

    Article code: 12381

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €282.79
    available in about 10/15 days

    Article code: 12372

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

    ExtremaRatio - Dobermann IV - Classic Satin - knife

    €336.07
    available in about 10/15 days

    Article code: 12352

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Waki ​​30cm. - Roast Knife

    €354.92
    available in about 10/15 days

    Article code: 12320

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho 15cm. - Chef's knife

    €275.41
    available in about 10/15 days

    Article code: 12321

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €216.39

    Article code: 12322

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kato 15cm. - Santoku Knife

    €293.44

    Article code: 12323

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kato Desert Warfare 15cm. - Santoku Knife

    €193.44
    available in about 10/15 days

    Article code: 12324

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €200.00

    Article code: 12325

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Psycho 19cm. - Chef's knife

    €302.46
    available in about 10/15 days

    Article code: 12326

  • ExtremaRatio - T-Razor Testudo - knife

    ExtremaRatio - T-Razor Testudo - knife

    €172.95

    Article code: 12259

  • ExtremaRatio - T-Razor - knife

    ExtremaRatio - T-Razor - knife

    €186.89

    Article code: 12260

  • ExtremaRatio - MF1 Desert Warfare - coltello chiudibile

    ExtremaRatio - MF1 Desert Warfare - coltello chiudibile

    €263.93
    available in about 10/15 days

    Article code: 12277

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

    ExtremaRatio - Fulcrum S Testudo - Coltello

    €263.11

    Article code: 4252

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

    ExtremaRatio - Fulcrum Civil Bayonet - Testudo - knife

    €360.66
    available in about 10/15 days

    Article code: 12237

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR - Karambit Collector's Edition - knife

    €270.49

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR Testudo - Karambit Limited Edition - knife

    €286.89

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1TK Folder - Training Knife

    €73.77

    Article code: 12226

  • ExtremaRatio - Resolza Stone Washed - knife pattada

    ExtremaRatio - Resolza Stone Washed - knife pattada

    €156.56

  • ExtremaRatio - Resolza Testudo - knife pattada

    ExtremaRatio - Resolza Testudo - knife pattada

    €167.21

    Article code: 12079

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR - Karambit Limited Edition - knife

    €192.62

  • Extrema Ratio - Skar

    ExtremaRatio - SKAR Testudo - Karambit Limited Edition - knife

    €204.92

  • Extrema Ratio - Skar

    ExtremaRatio - TK SKAR Training Karambit aluminum - knife

    €32.79

    Article code: TK-SKAR

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mato Grosso - Machete - Knife

    €271.31
    available in about 10/15 days

    Article code: 12020

  • Victorinox - Fodero in pelle 4.0523.3

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

    €16.39

    Article code: 10983

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €109.84

    Article code: 12000

  • ExtremaRatio - BF3 Dark Talon - knife

    ExtremaRatio - BF3 Dark Talon - knife

    €150.00

    Article code: 4254

  • ExtremaRatio - Fulcrum Compact Desert Warfare - coltello

    ExtremaRatio - Fulcrum Compact Desert Warfare - knife

    €195.90

    Article code: 4153D

  • ExtremaRatio - BF2V - Sailing Knife

    ExtremaRatio - BF2V - Sailing Knife

    €157.38

    Article code: 10888

  • ExtremaRatio - BF2CD - Drop Point - knife

    ExtremaRatio - BF2CD - Drop Point - knife

    €144.26

    Article code: 4225

  • ExtremaRatio - BF2CD Desert Warfare Drop Point

    ExtremaRatio - BF2CD Desert Warfare Drop Point - coltello

    €163.93

  • ExtremaRatio - BF2CT Desert Warfare Tanto Point - coltello

    ExtremaRatio - BF2CT Desert Warfare Tanto Point - coltello

    €163.93

  • ExtremaRatio - BF2CT  - Classic Tanto - tactical knife

    ExtremaRatio - BF2CT - Classic Tanto - tactical knife

    €144.26

    Article code: 10886

  • ExtremaRatio - Nemesis - coltello

    ExtremaRatio - Nemesis - coltello

    €335.25
    available in about 10/15 days

    Article code: 4148

  • ExtremaRatio - Selvans Green + Survival Kit - knife

    ExtremaRatio - Selvans Green + Survival Kit - knife

    €436.89
    available in about 10/15 days

    Article code: 4355S

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - RAO II - knife

    €288.52

    Article code: 10167

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K.1 Testudo - Neck Knife

    €104.10

    Article code: 10181

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €95.08

    Article code: 10802

  • ExtremaRatio - Col Moschin Compact

    ExtremaRatio - Col Moschin Compact - Testudo - knife

    €195.90

    Article code: 4361

  • Leatherman - Wave - pinza multiuso

    ExtremaRatio - TK Tool 2.0 Testudo - Multitool

    €39.34
    available in about 10/15 days

    Article code: 10173

  • Leatherman - Wave - pinza multiuso

    ExtremaRatio - TK Tool 2.0 Testudo - Multitool

    €53.28

    Article code: 10154

  • /

    ExtremaRatio - Police Evo - Multitool - knife

    €386.07
    available in about 10/15 days

    Article code: 10091

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Kreios - Heavy Utility Machete - Knife

    €342.62
    available in about 10/15 days

    Article code: 10067

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

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

    €290.98

  • ExtremaRatio - Dicok Diving Compact Knife - coltello da sub

    ExtremaRatio-Dicok Compact Diving Knife-divers knife

    €157.38

    Article code: 10006

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

    ExtremaRatio - Dobermann IV - Tactical Testudo - knife

    €276.23

    Article code: 5001

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