Wheeler's 100-Piece Professional Gunsmithing Screwdriver Set is the kit that belongs on every gunsmithing bench. The diverse bit selection will put an end to burred, buggered, and busted up screw slots on any gun the comes your way. The bits make up the heart of any screwdriver set, and Wheeler's are the finest available. The bits are made from S2 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. Whether you're working on a Browning Superposed, a Remington 700, a Smith & Wesson revolver, or a Colt Single Action, you'll find that there's a bit to fit every screw on your gun.