Irwin 91831 Nutsetter, 5/16 in Drive, 1-7/8 in L, 1/4 in L Shank, Hex Shank

Made of shock-resistant and heat treated S2 steel for maximum strength and hardness, magnets are four times more powerful than common magnets. Positive retention of the screw improves installation rate. Universal 1/4 in hex shank fits most power tools and quick-change chuck Adapters. For use with sheet metal screws and other hexagonal head fasteners.