TOP QUALITY : Sharp edge, high hardness, accurate positioning, high precision, smooth cutting, impact resistance, high toughness. more smooth, less noise. Suitable for pistol drill, bench drill, vertical drilling machine hand held electric drill, stand motor-driven drilling machine and mobile ribbon type magnetism drilling machine, etc. WIDELY USED : Can be used for wood products perforation, mounted spherical door shoot tip, drawer, plastic products, wood, plywood, etc.