CPM-REX 45 Sprint Run Crucible CPM-REX 45 is a super-high-speed particle metallurgy tool steel enriched with large volumes of cobalt, tungsten, molybdenum, and vanadium. Its high cobalt content increases the steel’s attainable hardness and enhances the positive properties of steel's other alloys. The addition of vanadium promotes the formation of vanadium carbides, which provide high wear resistance, fine grain size, and increased toughness. A true steel connoisseur’s blade material, REX 45 is an ideal steel for this prestigious Sprint Run series being produced in Spyderco's USA factory. To further distinguish this unique family, all REX 45-bladed models feature a distinctive burnt-orange handle color. Sprint Runs Spyderco Sprint Runs are limited edition production runs of items not found in Spyderco's standard product line. They may be unique versions of current knives or special expressions of discontinued designs. Every Sprint Run is a unique, one-time-only event. Once that knife is sold out it will not be produced again in that exact form. Specifications Blade Length: 4.08" Closed Length: 5.08" Overall Length: 9.08" Cutting Edge: 3.58" Hole Diameter: 0.50" Blade Thickness: 0.125" Blade Material: CPM-REX 45 Tool Steel Blade Style: Drop Point Blade Grind: Full Flat Blade Finish: Satin Blade Edge: Plain Handle Material: Burnt Orange G10 Locking Mechanism: Lockback Pocket Clip: Tip-Up, Tip-Down, Left/Right Carry Model Number: C244GPBORE Model Name: Native Chief Weight: 3.9 oz. Made in USA