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Extrema Ratio Sethlans survival knife (Stone Washed, N690)
Description
Extrema Ratio Sethlans (Stone Washed, N690)
The Extrema Ratio Sethlans is a versatile fixed-blade survival knife designed to excel in a wide range of scenarios—from bushcraft and prepping to everyday backup use. Developed in collaboration with Master Advanced Instructor Daniele Dal Canto, it boasts an ergonomic G10 handle, a thinned blade profile for improved cutting, and a lightweight modular sheath system for swift deployment and custom carry options.
Key Features
- High-Performance Blade: Made from Böhler N690 steel, heat treated to ~58 HRC, ensuring excellent edge retention and corrosion resistance.
- Stone Washed Finish: Provides a non-reflective, rugged appearance that hides wear and tear.
- Ergonomic G10 Handle: The removable scales reveal a skeletonized tang for maximum weight reduction. Paracord wrapping is possible for further customization.
- Modular Kydex® Sheath: - Light, minimalist design with ambidextrous setup.
- Compatible with an optional belt clip for vertical or horizontal carry.
- Includes a mini pouch (M.O.L.L.E.-compatible) containing a two-sided sharpening stone and a firesteel for emergency fire-starting. - Multi-Purpose Use: Ideal for survival, bushcraft, and everyday fieldwork, or as a reliable backup blade.
Technical Specification
| Property | Specification |
|---|---|
| Weight | 207 g (7.30 oz) |
| Blade Length | 107 mm (4.21 in) |
| Total Length | 224 mm (8.82 in) |
| Blade Thickness | Thinned from 6.3 mm (0.25 in) down to 4 mm (0.15 in) to improve cutting performance |
| Blade Material | Böhler N690 (HRC ~58) |
| Blade Finish | Stone Washed |
| Main Grind | Flat |
| Handle Material | G10 |
About Extrema Ratio
Founded in Italy, Extrema Ratio specializes in designing and producing high-end professional knives tailored for military, public security, rescue operations, and extreme outdoor pursuits. Their product range spans from small folders to large kukris, all of which emphasize functionality, long operational life, and consistent quality. By focusing on modern treatments and top-grade materials, Extrema Ratio consistently delivers the best in tactical, survival, and hunting knives.
Manufacturer Information
Extrema Ratio S.R.L.
Via Traversa delle Ripalte, 72/78
59100 Prato (PO), Italy
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Website: Contact Page