AITOR Oso Negro Fixed 7.25" Black Sawback Blade, OD Green Polymer Handle and Hard Nylon SheathAITOR Oso Negro Fixed 7. 25" Black Sawback Blade, OD Green Polymer Handle and Hard Nylon Sheath The Legendary Oso Negro is considered by many people as one of the best in the world by its design, ergonomics and ease of sharpening with a contrasted hardness of 55 58 HRC. It's 12. 25" (310 mm) overall with an OD green textured polymer handle and black powder coated cross guard and pommel. Used in different military forces, this knife is one of the most