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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 - BF4 R knife Satin - coltello

    ExtremaRatio - BF4 Lucky Desert - knife

    €136.07

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BF4 Lucky Black - knife

    €144.26

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Shrapnel One Knife - Knife

    €188.52

    Article code: ER-SH-ONE

  • ExtremaRatio - BF4 R knife Satin - coltello

    ExtremaRatio - BF4 R knife Satin - knife

    €141.80

    Article code: ER-BF4R

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

    Extremaratio - Arditi Black - Single-edged dagger - knife

    €306.56

    Article code: ER-AR-B

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

    Extremaratio - Arditi Deluxe - Single-edged dagger - Limited Collector's Edition - Knife

    €527.87
    Available from late June
  • ExtremaRatio - 185° RAO - coltello

    ExtremaRatio - 185 ° RAO in Sanmai Japanese steel - knife

    €385.24

  • ExtremaRatio - 185° RAO - coltello

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

    €294.26

    Article code: 4247

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0 R CD - Stone Washed - knife

    €66.39

    Article code: BF0-R-CD

  • ExtremaRatio, BF1CD, Drop Point, coltello

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

    €66.39

    Article code: BF0-R-CD-DW

  • Extremaratio - Fulcrum II T - rough handle - Tanto - knife

    Extremaratio - Fulcrum II T - rough handle - Tanto - knife

    €309.84

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1CD Desert Warfare - Drop Point - knife

    €145.90

    Article code: ER-BF1CD-DW

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Wolf Gray - tactical knife

    €122.95

    Article code: ER-REQ-WG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Ranger Green - tactical knife

    €122.95

    Article code: ER-REQ-RG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Desert - tactical knife

    €122.95

    Article code: ER-REQ-DE

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem HCS - tactical knife

    €122.95

    Article code: ER-REQ-HC

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Requiem Black - tactical knife

    €131.97

    Article code: ER-REQ-BK

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Wolf Gray - tactical knife

    €123.77

    Article code: ER-MAM-WG

  • ExtremaRatio - T-Razor - coltello

    ExtremaRatio - Panthera Satin - folding knife

    €201.64

  • ExtremaRatio - T-Razor - coltello

    ExtremaRatio - Panthera Black - folding knife

    €186.07

    Article code: ER-PAN-BL

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1CD - Damascus Coreless - Limited Edition - knife

    €192.62

    Article code: ER-BF1CD-C

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF1CT - Damascus Coreless - Limited Edition - knife

    €192.62

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 Stone Washed - Knife

    €173.77

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 DG Stone Washed - Knife

    €176.23

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 Black - Knife

    €194.26

    Article code: ER-DEF2BL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender 2 DG Black - Knife

    €196.72

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender Stone Washed - Knife

    €168.85

    Article code: ER-DEFSW

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender DG Stone Washed - Knife

    €172.95

    Article code: ER-DEFDGSW

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender Black - Knife

    €190.98

    Article code: ER-DEFBL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Defender DG Black - Knife

    €193.44

    Article code: ER-DEFDGBL

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Satin in San Mai CoS - knife

    €245.08

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €360.65
    DISCONTINUED - FUORI PRODUZIONE
  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout Black - knife

    €162.30

    Article code: 12656

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Black - knife

    €165.57
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12658

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Scout 2 Satin - knife

    €145.08
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12659

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Desert - tactical knife

    €123.77

    Article code: ER-MAM-DE

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba HCS - tactical knife

    €123.77

    Article code: ER-MAM-HC

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Ranger Green - tactical knife

    €123.77

    Article code: ER-MAM-RG

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

    ExtremaRatio - Mamba Black - tactical knife

    €133.61

    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

    €154.92

    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

    €153.28

    Article code: ER-BF2RCD-D

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

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

    €151.64

    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

    €154.92

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

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

    €153.28

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

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

    €151.64

    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

    €311.48

    Article code: ER-AMFBL

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

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

    €305.74

    Article code: ER-AMFDE

  • ExtremaRatio - Kukri KS - Testudo - coltello

    ExtremaRatio - KH Black - Kukri Machete - knife

    €357.38
    delivery in 7/10 days (if available from the manufacturer)

    Article code: ER-KHB

  • 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

    €415.57
    delivery in 7/10 days (if available from the manufacturer)

    Article code: ER-GLAJ1

  • ExtremaRatio - set da barba - shaving kit - pennello e rasoio

    ExtremaRatio - shaving kit - brush and razor

    €635.24

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Task J - Jagdkommando - knife

    €307.38

  • 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
    SOLD OUT - TERMINATO
  • 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

  • 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

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €226.23
    delivery in 7/10 days (if available from the manufacturer)

    Article code: set-talon

  • ExtremaRatio, BF1CD, Drop Point, coltello

    ExtremaRatio - BF0CD - Stone Washed - knife

    €66.39

    Article code: 12645

  • ExtremaRatio - Selvans Desert + Survival Kit coltello machete

    ExtremaRatio - Selvans Desert + Survival Kit - survival knife

    €533.61
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 4355SD

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €142.62

    Article code: 12634

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €135.25

    Article code: 12635

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €145.90

  • 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

    €218.85

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - Nightmare Karambit - Stone Washed - folding knife

    €204.92
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12622

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 T Tanto Black - folding knife

    €293.44
    delivery in 7/10 days (if available from the manufacturer)

    Article code: ER-HF1T

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF1 D Drop Black - folding knife

    €293.44

    Article code: ER-HF1D

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2T Tanto Black - folding knife

    €304.10
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12614T

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - HF2D Drop Black - folding knife

    €304.10
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12614D

  • ExtremaRatio - MF0 - coltello chiudibile

    ExtremaRatio - MF0T Tanto Black - folding knife

    €230.33
    available in about 10/15 days

    Article code: 12596

  • ExtremaRatio - Resolza S Black - coltello chiudibile, knife, couteau, cuchillo, messer

    ExtremaRatio - Resolza S Black - folding knife

    €126.23

  • ExtremaRatio - Resolza L Black - coltello chiudibile, messer, couteau, cuchillo, knife, pattada

    ExtremaRatio - Resolza L Black - folding knife

    €190.16

    Article code: 12079L

  • ExtremaRatio - Resolza S Satin - coltello chiudibile

    ExtremaRatio - Resolza S Satin - folding knife

    €122.95

  • ExtremaRatio - Resolza L Satin - coltello chiudibile pattada

    ExtremaRatio - Resolza L Satin - folding knife

    €180.33

    Article code: 12078L

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - Shrapnel OG Full Handle - Black - knife

    €186.07
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12553

  • ExtremaRatio - Shrapnel OG Testudo - coltello

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

    €193.44
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12555

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    Extrema Ratio - Corvo Black - tactical knife

    €239.34
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12525

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

    ExtremaRatio - Culter Venatorius - Limited Edition - Hunting Knife

    €889.75
    DISCONTINUED
  • Victorinox - Fodero in pelle 4.0523.3

    ExtremaRatio - coupling Belt Clip Tek-Lok - Knife Accessories

    €19.67

    Article code: ER-TEKLOK

  • ExtremaRatio - Collaborazione Collini 2015 - Limited Edition - coltello

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

    €323.77
    DISCONTINUED
  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €104.10

    Article code: 12448

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €111.48

    Article code: 12449

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €122.95

    Article code: 12450

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €131.15

    Article code: 12451

  • ExtremaRatio - Kreios - Heavy Utility Machete - Coltello

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

    €135.25

    Article code: 12468

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 S Testudo - knife

    €222.95

    Article code: 12437

  • ExtremaRatio - MF3D BC - Ingredior Drop coltello extrema ratio

    ExtremaRatio - MF3D - Ingredior Drop Testudo - knife

    €298.36
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 4358D

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

    ExtremaRatio - Dobermann IV - Africa - knife

    €486.07
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12384

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

    ExtremaRatio - Dobermann IV S - Africa - knife

    €482.79

    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

    €294.26

  • ExtremaRatio - Shrapnel OG Testudo - coltello

    ExtremaRatio - T4000 C Testudo - knife

    €190.16

  • 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

    €343.44

    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
    delivery in 7/10 days (if available from the manufacturer)

    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
    delivery in 7/10 days (if available from the manufacturer)

    Article code: 12323

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