7+1PCS Different DrillsWoodworking drill bits of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm and a hex wrench. You can use the hex key to loosen and tighten the screw and adjust the length of the cutter. it also can use for disassembly and installation of drill bits HSS SteelOur wood drill bits are made of HSS steel, forming strong and sharp countersunk hole, with high hardness and good wear resistance. wear and heat resistant, which can be cut in any direction to ensure accurate and clean flat-bottomed holes Tricuspid Centering & Five-edge ChamferThree-point countersink ensure the drill bits will not produce offset, non-slip, good for accurate and fast drilling. The five-edged chamfer design of the countersink bit can clear wood and debris more quickly and automatically Applicationfor mounting the ball point of the drawer; punching wood products, plastic products, wood and plywood Use with Power ToolsSuitable for drill press, hammer drill, bench drill, vertical drill , the column or portable drill and the mobile band drill