Extrema Ratio NK1 Neck Knife Black EX. This Fixed Blade Knives from the expert blade manufacturers at Extrema Ratio is manufactured using an extremely resilient Bohler N690 blade material which will retain an edge for incredibly long durations before the need to be honed. The handle on the Extrema Ratio NK1 Neck Knife offers you a tremendous hold in any situation. If you are looking for a top grade knife that will perform admirably in a variety of conditions discover the Extrema Ratio NK1 Neck Knife. Specifications for Extrema Ratio NK1 Neck Knife: Overall Length: 5in Blade Length: 1 3/4in Blade Material: Bohler N690 Steel Features of Extrema Ratio NK1 Neck Knife: 5in. overall 1 3/4in. blade One piece Bohler N690 stainless construction Molded black Kydex neck sheath with black cord lanyard Package Contents: Extrema Ratio NK1 Neck Knife Extrema Ratio EX123NK1BL: NK1 Neck Knife Black