Wheelers Professional Gunsmith 43 Piece Screwdriver Set is a kit that belongs on every gunsmiths bench. The bits make up the heart of any screwdriver set and theyre made from S2 tool steel and hardened to 5658 Rockwell C. Its hollowground bits are gently curved as it reaches the tip instead of being straight to protect the fit and finish of the screw. The hollowground shape spreads force equally along the sides of the screw slot resulting in no damage. The 43 Piece Screwdriver Set features an overmolded screwdriver handle to ease all of your work. Includes storage kit.