River Manufacturing Zero Original Smooth Operator Black 6061 AluminumExperience the addictive satisfaction of Zero! The clicks and haptic feel of the retract will keep you coming back for more. The beefy key and spring force create a satisfying click and clack, making it hard to put down. The 6061 Aluminum version of the Zero utility knife features a satin anodized surface finish in various colors. This version comes machined with our smooth operator pattern. The aluminum utility knife is light and quick offering a