Features: *Carbide steel material is preferred, which is harder than ordinary drill bits and more resistant to wear. *Four-blade design, small incision resistance and small incision resistance, precise and effortless punching. *The surface of the drill body is treated by centerless grinding, and the chip removal is smoother. *The shank of the drill bit is cut into a solid hexagon, which makes the electric drill clamping more secure and the drill hole less slippery. Specification: Name: Multi-function triangle drill Material: Carbide Colour: Black Cutting diameter: :6mm/8mm/10mm/12mm/5mm/4mm Features: Carbide, versatile Compatible equipment: lithium drill/hand drill/bench drill Uses: glass, ceramics, vitrified tiles, all-ceramic tiles, brick walls, wood, plastic Package list: 5PCS 6mm/8mm/10mm/12mm/5mm/4mm multi-function triangle drills Note: 1. Lithium electric drills lower than 24V are not recommended for use, and they cannot be scored without sufficient strength. 2. When perforating walls, you must change the position of the rebar, otherwise it will cause the edge to collapse. 3. Vitrified tiles, all-ceramic tiles, and granite need to be cooled with water