Extrema Ratio N.K.2 Fixed Blade Knife 5in N690 Stainless Tanto Blade Black Kydex Handle. 7cm) overall. 2" (5.08cm) black oxide coated Bohler N690 stainless tanto blade. One-piece construction. Lanyard hole. Black Kydex neck sheath. Boxed. Specifications for Extrema Ratio N.K.2 Neck Knife Black: Manufacturer: Extrema Ratio Blade Length: 5.08 cm Package Contents: Extrema Ratio N.K.2 Neck Knife Black Extrema Ratio 04.1000.0204/BLK: N.K.2 Fixed Blade Knife 5in N690 Stainless Tanto Blade Black Kydex Handle