The job gets done quicker when you have Century Drill & Tool Star Screwdriver Bits. The screwdriver bits, made from premium S2 steel, offer an incredibly long tool life while driving common or mild steel screws or case hardened screws. Their versatile design fits all power screw guns, cordless screwdrivers, variable speed electric drills, and quick-change adapters. Thanks to their length, the steel bits are a versatile and useful addition to any tool collection. Screwdriver bits made from premium S2 steel for long tool life while driving common or mild steel screws or case hardened screws 1/4-in. power drive shank fits all power screw guns, cordless screwdrivers, variable speed electric drills, and quick-change adapters 2-in. overall length 25 bits included per package