Steel Countersink Set (3-Piece)Get a fast and efficient way to switch from screw driving to hole drilling and back with the DEWALT Steel Countersink Set. By just tightening the Rapid Load Holder (sold separately) into your drill or drill driver, you can quickly insert or eject hex shank drill bits and screw driving tips as necessary. This set works with all 3 8 and 1 2 in. drills and drill drivers. California residents see Prop 65 WARNINGS 1 4 in. shank that requires a minimum 1 4