MEGAPRO 9BP-ENPD-2A Hex Double Ended Bit Set, 2 In, PK 2. More details: Screwdriver Replacement Bit Set, Number of Pieces 2, Shank Size (In.) 1/4, Material S2 Steel w/ Electroless Nickel Plating, Application For Use In Driving Screws and Other Fasteners by Hand Tool Application or with Corded or Cordless Drills, Includes Phillips #0 and #3, Square(Robertson) #0 and #3, Package Quantity 2