NUTSETTER 50 PIECE 1/4X1-7/8IN

"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"" hex shank fits most power tools and quick-change chuck adapters. For use with sheet metal screws and other hexagonal head fasteners."