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First project born with the brand of Collini KNIVES.IT cutlery and which sees in its final realization the collaboration of several partners.

Collection Edition

In order to obtain a tool of the highest quality, we have entrusted the production and engineering to Extrema Ratio, the designer to the Belgian Laurent LoTactical, the realization of the two kydex sheaths (one deep carry and one more compact) handcrafted by the knifemaker Simone Tonolli, while for the clip we opted for the efficient quality of the products of the American ULTICLIP.


Intended use: Neck Knife / Collection knife / Tactical knife

Type of production: Industrial
Production Lama: Italy
Blade: stainless steel N690Co 58 / 60HRC
Blade treatment: Black PVD cat. MIL-C-13924
Handle: stainless steel N690Co 58 / 60HRC
Blade length: 40mm.
Blade thickness: 5.5mm.
Total length: 166mm.
Weight: 86g.
Sheath: two Kydex sheaths handcrafted by the Italian Knife Maker Simone Tonolli, with ULTICLIP steel clip
Packaging: Zip Pouch + PVC + Extrema Ratio black cardboard box
Notes: knife engineered and made by Extrema Ratio - numbered
Designer: Laurent - LoTactical


The Tengu is named after a mythical creature from Japanese folklore that is represented with both human and raven characteristics, they had a reputation for being great warriors and legends say that some martial arts founders were trained by them.

- It has been designed to be used in many different grips, but is particularly effective in reverse grip.
- The design and the sheath are functional for a practical fixing and thanks to the ULTICLIP system, it can be anchored in many and different options. Through the use of paracord it can also be placed around the neck.
- With its thickness of 5.5 mm, it is extremely robust and thanks to the shape of the handle, it is comfortable even with large hands or with the use of gloves.
- Compact blade, robust and very functional both for precision cutting work and, thanks to the serrated part of the back, for leathery materials. Moreover, the tip, thanks to its a tanto shape, is very robust and optimal for engraving work.


More Information
BrandExtrema Ratio
Country of productionItaly
Blade TypeFixed
Blade Length4/5cm
EdgeHalf Serrated
Blade TipTanto
Blade thickness5,5 mm
Blade FinishBlack (Teflon, PVD, DLC..)
Stainless SteelN690Co
Handle MaterialMetallic
RarityVery Rare
Materials and Finishes7,5
Steel Quality7,5
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