8pcs 3 Inch Magnetic Long Hex Cross Phillips Screw Head Screwdriver Bits Electric Screwdriver Set Package Included:8 X Screwdriver Bits Materials: S2 alloy steel Type of head: cross / for phillip Type of shank: 6.35mm / 1/4 inch hex Those bits fit for electric screwdrivers, hand screwdrivers, electric drills, air drills and so forth.