GearWrench 9535 2 Piece GW Bit Adapters, 1/4 and 5/16 Allows the use of 1/4-Inch drive, and 5/16-Inch drive hex shank screwdriver bits to be used in conjunction with GearWrench 1/2-Inch reversible ratching combination wrench Bit adapters are made from finest tool steel for precision use Long tool life