It can be applied to iron, steel, copper, aluminum and other processes. Each drill has a double head and a standard angle grinder. Sharp and durable, precise positioning, clear knife edge. The cutting speed is fast, and the chip removal effect is good. Used to punch holes in the precise center of the metal. feature : It can be applied to iron, steel, copper, aluminum and other processes. Precise and durable positioning, clear cutting edge. The cutting speed is fast and the chip removal effect is good. For precise center drilling of metals. When rotating between points, the two end faces of the part receive the corresponding centering holes. Prepare tools to hold the exact position of the drill hole. Packing size: 9.6cmx7cmx1.2cm Shipping Quantity: 1 set, there are 6 drill bits in it