Detailed Product Description: Features: Carbon steel material is preferred, which is harder than ordinary drills and more wear-resistant. Four-blade design, small notch resistance and small notch resistance, precise and trouble-free punching. The surface of the drill body is treated by centerless grinding, and chip removal is smoother. The shank of the drill is cut into a solid hexagon, which makes the attachment of the electric drill more secure and the drill hole less slippery. Specification: Name: multi-functional triangular drill bit Material: carbide Color: black Size: 4mm/5mm/6mm/8mm/10mm/12mm (optional) Features: carbide, versatile Compatible equipment: lithium drill/hand drill/bench drill Application: glass, ceramics, vitrified tiles, tiles ceramic, brick walls, wood, plastic Note: Lithium electric drills lower than 24V are not recommended for use and cannot be obtained without sufficient strength. When perforating walls, please change the position of the rebar, otherwise it will cause the edges to fall. Vitrified tiles , ceramic tiles and granite need to be cooled with water Package list: 1 multi-function triangular drill bit