1、Spiral chip flute, high-speed operation and fast chip removal, improve efficiency. 2、Triangular drill shank, suitable for a variety of electric drill chucks, can be used for clamping and fastening hand electric drills, impact drills, bench drills, etc. 3、The drill bit of this multifunction drill has incisive cutting, high smoothness and fast working speed. 4、This drill is used to make holes in wood, ceramic tiles, iron plates, plastic plates, red bricks, and wall. 5、Made of carbide material, low resistance, high hardness, speeding up the work process. 5 x Drill  Item Type: Multifunctional Drill BitMaterial: CarbideThe Following Materials Can Be Directly Drilled: Drilling for wall, drilling for wood, drilling for aluminum, drilling for copperThe Following Materials Need To Add Water Side Drill: Steel, stainless steel, concrete, glass tile, red brick, marble, glazed exterior, bubble brick, graniteDrill Diameter: Approx. 10mm / 0.4inTotal Length: Approx. 121.6mm / 4.8inHole Depth: Approx. 72mm / 2.8inShank Diameter: Approx. 7.5mm / 0.3inDrill Shank Type: Triangular drill shank