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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 - Sethlans Survival - N690 Stone Washed - Knife

    €323.77

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Sethlans Survival - D2 Exp Dark - Knife

    €323.77

    Article code: ER-SETH-D2

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

    ExtremaRatio - Dobermann II knife - PRIVATE COLLECTION - knife

    €254.10

    Article code: ER-DOB-M-CP

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Misericordia - 4th Alpine Paratroopers Regiment - tactical knife

    €150.82

    Article code: ER-MIS-BK

  • ExtremaRatio - Task Testudo - Coltello

    ExtremaRatio - Task Desert Warfare - Tactical Knife

    €296.72

    Article code: ER-TASK-DW

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Frame Rock Titan - Blue Satin - folding knife

    €424.59

    Article code: ER-FRTI-BL

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    Knives.it by ExtremaRatio - Tengu Tactical Black knife - Standard Edition - Icepick Karambit - knife

    €110.66

    Article code: KN-TENGU-S

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

    ExtremaRatio - Frame Rock Titan - Black DLC - folding knife

    €430.33

    Article code: ER-FRTI-BK

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    Knives.it by ExtremaRatio - Tengu Tactical Black knife - Collection Edition - Icepick Karambit - knife

    €127.05

    Article code: KN-TENGU

  • ExtremaRatio - 39-09 COFS Combat - coltello

    ExtremaRatio - 39-09 - Operational Command Special Forces COFS Combat - knife

    €282.79

    Article code: 4364

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - E.C.M. Cobra - ECM Einsatzkommando - Knife

    €302.46

    Article code: ER-ECM

  • ExtremaRatio, MF1 BC, coltello chiudibile

    ExtremaRatio - MF1 BC knife - PRIVATE COLLECTION - folding knife

    €200.82

    Article code: ER-MF1BC-CP

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Giant Mamba - Black - tactical knife

    €240.16

    Article code: ER-GMA-BK

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Giant Mamba - Ranger Green - tactical knife

    €206.56

    Article code: ER-GMA-RG

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Giant Mamba - HCS - tactical knife

    €206.56

    Article code: ER-GMA-HC

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact C Knife HCS - tactical knife

    €156.56

    Article code: ER-CC-HC

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact C Knife Black - tactical knife

    €167.21

    Article code: ER-CC-BK

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Contact C Knife Ranger Green - tactical knife

    €156.56

  • Victorinox - Fodero in pelle 4.0523.3

    Ulticlip - SLIM 2.2 universal small clip - Knife Accessories

    €11.88

    Article code: SLIM2.2

  • Victorinox - Fodero in pelle 4.0523.3

    Ulticlip - SLIM 3.3 universal medium clip - Knife Accessories

    €11.88

  • Victorinox - Fodero in pelle 4.0523.3

    Ulticlip - ULTICLIP3 + large universal clip - Knife Accessories

    €12.30

    Article code: ULTICLIP3+

  • ExtremaRatio, MF1 BC, coltello chiudibile

    ExtremaRatio - T911 Tuscania Rescue Tool - folding knife

    €241.80

    Article code: ER-T911

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 R knife Satin - knife

    €136.89

    Article code: ER-BD4RB

  • ExtremaRatio - Resolza Stone Washed - coltello

    ExtremaRatio - Resolza 10 - Black - pattada knife

    €145.90

  • ExtremaRatio - Resolza Stone Washed - coltello

    ExtremaRatio - Resolza 10 - Stone Washed - pattada knife

    €143.44

    Article code: ER-RE10-SW

  • 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

    Article code: ER-CON-GR

  • ExtremaRatio - BF2V - Coltello per barca

    ExtremaRatio - BF2H Helmsman - Multitool Sailing Knife

    €173.77

    Article code: ER-BF2H

  • 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

  • ExtremaRatio - Pugio SE Black - Filo Singolo - coltello

    ExtremaRatio - Nimbus Special - Collector's Edition - Knife

    €584.43
    Fuori Produzione - Discontinued
  • 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

  • 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 - 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 - 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

    Article code: ER-BD0RBK

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - HCS - Stone Washed - knife

    €69.67

  • ExtremaRatio, BF1CD, Drop Point, coltello

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

    €69.67

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BD0 R - Desert - Stone Washed - knife

    €69.67

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 Lucky Desert - knife

    €139.34

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BF4 Lucky Black - knife

    €147.54

    Article code: ER-BD4LB

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BD4 R knife Satin - knife

    €145.08

    Article code: ER-BD4R

  • 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, 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

  • 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

  • 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

    Article code: ER-PAN-BL

  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185 ° RAO - first version - knife

    €300.82
    Fuori Produzione - Discontinued
  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 Stone Washed - Knife

    €177.87

    Article code: ER-DEF2SW

  • 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

  • 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

    Article code: 12656

  • 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

    Article code: ER-MAM-BK

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

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

    €158.20

  • 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 - 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

  • ExtremaRatio - Glauca B1 G.I.G.N

    ExtremaRatio - Glauca J1 Jagdkommando - knife

    €424.59

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Task J - Jagdkommando - knife

    €313.93

  • 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 - Sector 2 table knife 7cm - Table knife

    €45.08

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0CD - Stone Washed - knife

    €68.03

    Article code: 12645

Items 1 to 80 of 271 total

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