Screwdriver Bit Set, Number of Pieces 8, Shank Size 1/4 In., Alloy Tool Steel, For Driving Heat Treated Screws, Such As Sheet Metal, Self Tapping And Self Drilling Screws With Screwguns And Cordless Or Electric Drills, Includes Phillips Bit 1, 2, 3, Socket Adapter, Slotted 6-8, 8-10, 10-12, 1/4 Inch Magnetic Hex Head Holder, For Hand or Power Drive