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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 80 of 237 total

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  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 R knife Satin - knife

    €136.89

    Article code: ER-BD4RB

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

    ExtremaRatio - Harpoon II knife Testudo - PRIVATE COLLECTION - knife

    €270.49

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185 ° RAO knife - USED - knife

    Regular Price: €300.82

    Special Price €233.61


    Article code: ER-RAO-U

  • ExtremaRatio - MF2 Ruvido - coltello chiudibile

    ExtremaRatio - MF2 Rough knife - folding knife

    €266.39

    Article code: 4352R

  • ExtremaRatio - Lamborghini Reventón - Limited Edition - coltello

    ExtremaRatio - Lamborghini Reventon - Limited Edition - knife

    €450.82

    Article code: 4256

  • ExtremaRatio, RES II, Rescue Emergency Survival, coltello

    ExtremaRatio - RES II - Rescue Emergency Survival - knife

    €323.77

  • ExtremaRatio - Resolza Stone Washed - coltello

    ExtremaRatio - Resolza 10 - Black - pattada knife

    €145.90

    Article code: ER-RE10-BK

  • Extremaratio - Fulcrum II T Folder - Tanto - MANICO RUVIDO - COLLEZIONE PRIVATA - coltello

    Extremaratio - Fulcrum II T Folder - Tanto - ROUGH HANDLE - PRIVATE COLLECTION - knife

    Regular Price: €316.39

    Special Price €241.80


  • ExtremaRatio - Resolza Stone Washed - coltello

    ExtremaRatio - Resolza 10 - Stone Washed - pattada knife

    €143.44

    Article code: ER-RE10-SW

  • ExtremaRatio - MPC knife Tiratori Scelti - coltello

    ExtremaRatio - MPC knife Selected Shooters - PRIVATE COLLECTION - knife

    Regular Price: €352.46

    Special Price €282.79


  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact Wolf Gray Knife Stone Washed - tactical knife

    €204.92

    Article code: ER-CON-G

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact Ranger Green Knife Stone Washed - tactical knife

    €204.92

  • ExtremaRatio - Nemesis knife - USATO - coltello

    ExtremaRatio - Nemesis knife - USED - knife

    Regular Price: €350.00

    Special Price €192.62


  • ExtremaRatio - BF2V - Coltello per barca

    ExtremaRatio - BF2H Helmsman - Multitool Sailing Knife

    €173.77

  • ExtremaRatio - Selvans - Heavy Utility Survival Knife - coltello

    ExtremaRatio - Selvans - Heavy Utility Survival Knife

    €355.74

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact Knife Black - tactical knife

    €237.70

    Article code: ER-CONT-B-B

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact Desert Knife Stone Washed - tactical knife

    €204.92

    Article code: ER-CONT-DES

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Silente Knife Black - NOCS State Police - knife with multi-purpose pliers

    €405.74

    Article code: ER-SILENTE

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Nimbus Black Ordinanza - Knife

    €273.77

    Article code: ER-NIMBUSOR

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Nimbus Special - Collector's Edition - Knife

    €584.43

    Article code: ER-NIMBUSLE

  • ExtremaRatio - Police I knife - Multiuso - coltello

    ExtremaRatio - Police I knife - Multi-purpose 2 blades - knife

    €196.72

    Article code: ER-POLICE

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

    ExtremaRatio - Fulcrum Bayonet NFG Black - Knife

    €375.41

    Article code: ER-FULNFGB

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Nimbus Black Operative - knife

    €236.89

    Article code: ER-NIMBUSOP

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD2 R Satin - knife

    €132.79

    Article code: ER-BD2R

  • Extremaratio - Venom

    Extremaratio - Venom Stone Washed Half Serrated - Knife

    €259.02
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)
  • ExtremaRatio - S.E.R.E.1 - coltello - Extrema Ratio Sere 1

    ExtremaRatio - SERE 2 - GOI Gruppo Operativo Incursori - rescue knife

    €313.11

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

    ExtremaRatio - Fulcrum Bayonet knife NFG Desert SW - knife

    €239.34

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD2 Lucky Desert knife - knife

    €127.05

    Article code: ER-BD2-D

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD2 Lucky Black knife - knife

    €134.43

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Leucoton Black - knife

    €248.36

    Article code: ER-LEUCO

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - N.K. Steel Talon - Neck Knife - NKST - Knife

    €121.31

    Article code: ER-NKST

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - Black - Stone Washed - knife

    €69.67

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - HCS - Stone Washed - knife

    €69.67

    Article code: ER-BD0RHC

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - Ranger Green - Stone Washed - knife

    €69.67

    Article code: ER-BD0RRG

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - Desert - Stone Washed - knife

    €69.67

    Article code: ER-BD0RDE

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 Lucky Desert - knife

    €139.34

    Article code: ER-BD4LD

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BF4 Lucky Black - knife

    €147.54

    Article code: ER-BD4LB

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Shrapnel One Knife - Knife

    €192.62

    Article code: ER-SH-ONE

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 R knife Satin - knife

    €145.08

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

    Extremaratio - Arditi Black - Single-edged dagger - knife

    €313.11

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185° RAO - 2018 Version - heavy folding knife

    €300.82

    Article code: 4247

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0 R CD - Stone Washed - knife

    €68.03

    Article code: BF0-R-CD

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0 R CD Desert Warfare - Stone Washed - knife

    €68.03

    Article code: BF0-R-CD-DW

  • Extremaratio - Fulcrum II T Black - Tanto - knife

    Extremaratio - Fulcrum II T Black - Tanto - knife

    €316.39
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)

    Article code: 4146R

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1CD Desert Warfare - Drop Point - knife

    €149.18

    Article code: ER-BF1CD-DW

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Wolf Gray - tactical knife

    €125.41

    Article code: ER-REQ-WG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Ranger Green - tactical knife

    €125.41

    Article code: ER-REQ-RG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Desert - tactical knife

    €125.41

    Article code: ER-REQ-DE

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem HCS - tactical knife

    €125.41

    Article code: ER-REQ-HC

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Black - tactical knife

    €135.25

    Article code: ER-REQ-BK

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Wolf Gray - tactical knife

    €126.23

    Article code: ER-MAM-WG

  • ExtremaRatio - T-Razor - coltello

    ExtremaRatio - Panthera Satin - folding knife

    €205.74

    Article code: ER-PAN-SA

  • ExtremaRatio - T-Razor - coltello

    ExtremaRatio - Panthera Black - folding knife

    €190.16
    Disponibile in 10/15gg (previa disponibilità nei magazzini del produttore)

    Article code: ER-PAN-BL

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185 ° RAO - first version - knife

    €300.82

    Article code: ER-185RAO

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 Stone Washed - Knife

    €177.87
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)

    Article code: ER-DEF2SW

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 DG Stone Washed - Knife

    €180.33

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 Black - Knife

    €198.36

    Article code: ER-DEF2BL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 DG Black - Knife

    €200.82

    Article code: ER-DEF2DGBL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender Stone Washed - Knife

    €172.95

    Article code: ER-DEFSW

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender DG Stone Washed - Knife

    €177.05

    Article code: ER-DEFDGSW

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender Black - Knife

    €195.08

    Article code: ER-DEFBL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender DG Black - Knife

    €197.54

    Article code: ER-DEFDGBL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout Black - knife

    €165.57

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Black - knife

    €168.85
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)

    Article code: 12658

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Satin - knife

    €148.36
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)

    Article code: 12659

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Desert - tactical knife

    €126.23

    Article code: ER-MAM-DE

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba HCS - tactical knife

    €126.23

    Article code: ER-MAM-HC

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Ranger Green - tactical knife

    €126.23

    Article code: ER-MAM-RG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Black - tactical knife

    €135.25

  • ExtremaRatio - BF2 R CD - Razor Opening - Black Drop Point - knife

    ExtremaRatio - BF2 R CD - Razor Opening - Black Drop Point - knife

    €158.20

    Article code: ER-BF2RCD-B

  • ExtremaRatio - BF2 R CD - Razor Opening - Desert Warfare Drop Point - knife

    ExtremaRatio - BF2 R CD - Razor Opening - Desert Warfare Drop Point - knife

    €156.56

  • ExtremaRatio - BF2 R CD - Razor Opening - Stone Washed Drop Point - knife

    ExtremaRatio - BF2 R CD - Razor Opening - Stone Washed Drop Point - knife

    €154.92

    Article code: ER-BF2RCD-S

  • ExtremaRatio - BF2 R CT - Razor Opening - Black Tanto Point - knife

    ExtremaRatio - BF2 R CT - Razor Opening - Black Tanto Point - knife

    €158.20

    Article code: ER-BF2RCT-B

  • ExtremaRatio - BF2 R CT - Razor Opening - Desert Warfare Tanto Point - knife

    ExtremaRatio - BF2 R CT - Razor Opening - Desert Warfare Tanto Point - knife

    €156.56

    Article code: ER-BF2RCT-D

  • ExtremaRatio - BF2 R CT - Razor Opening - Stone Washed Tanto Point - knife

    ExtremaRatio - BF2 R CT - Razor Opening - Stone Washed Tanto Point - knife

    €154.92
    Available in 10/15 days (subject to availability in the manufacturer's warehouses)

    Article code: ER-BF2RCT-S

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

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

    €318.03

    Article code: ER-AMFBL

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

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

    €312.30

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout Satin - knife

    €140.98

    Article code: 12657

  • ExtremaRatio - Glauca B1 G.I.G.N

    ExtremaRatio - Glauca J1 Jagdkommando - knife

    €424.59

    Article code: ER-GLAJ1

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Task J - Jagdkommando - knife

    €313.93
    Disponibile in 10/15gg (previa disponibilità nei magazzini del produttore)

    Article code: ER-TASKJ

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