HSS drills are suitable for use on metal, timber, chipboard & plywood. Supplied in a robust plastic case. 21 Piece quick change multi use drill & bit set, 6 mm / 1/4in shank. contains 3, 4, 5, 6, 8, 10 mm wood drillbits 13, 16, 19, 22, 25 mm Flat Bits 4, 6 mm slotted screwdriver bits 1, 2, 3 Phillips screwdriver bits 1, 2, 3 Pozidriv screwdriver bits Countersink Magnetic Quick Change chuck.