Wheeler's Professional Gunsmith 43 Piece Screwdriver Set is a kit that belongs on every gunsmith's bench. The bits make up the heart of any screwdriver set and they're made from S2 tool steel and hardened to 56-58 Rockwell "C". Its hollow-ground bits are gently curved as it reaches the tip instead of being straight to protect the fit and finish of the screw. The hollow-ground 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.