zvd drill bit set 15 35mm 5pcs, carbide wood drill bit high speed steel flat wing hinge hole drilling cemented carbide carbon counterdrill drill

good material made from tungsten steel and heat treated, the blade features high precision, smooth cutting operation, good impact resistance and good toughness. high speed steel shank, solid suitable for drill press, hammer drill, drill press, vertical drill, handheld electric drill, stand motor dri