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