The 43-Piece Professional Gunsmithing Screwdriver Set features the most popular bits for gunsmithing. As any gunsmith will tell you, screwdrivers are their bench's most important and most used tool. These bits are made from S2 tool steel and hardened to 56-58 Rockwell "C". Also featured on these bits is the Hollow-Ground design which has a gentle curve as it reaches the tip of the bit instead of being straight throughout the length of the tip. This will protect the fit and finish of the screw and spread force equally along the sides of the screw slot, so the head of the screw and the tip are not damaged. The kit has a screwdriver with a non-slip, over-molded handle and a storage case to keep everything easy to find on your bench.