Wheeler"s Deluxe Gunsmithing Screwdriver Set is the kit that belongs on every gunsmithing bench - the well thought-out bit selection will put an end to burred, buggered, busted up screw slots on any gun that comes your way. The bits make up the heart of any screwdriver set, and Wheeler"s are the finest available. They"re made from S2 tool steel and hardened to 56-58 Rockwell "C." Unlike other screwdriver suppliers,Wheeler"s engineers measured the screws on over one hundred modern and antique firearms to make sure that we offered bits for every situation