Quantity: 5 pieces of drill bits Size: 3MM Black Triangle Diamond + 4MM Black Triangle Diamond + 5MM Black Triangle Diamond + 6MM Black Triangle Diamond + 8MM Black Triangle Diamond Material - Made of high quality tungsten carbide and reinforced head carbide, the hardness is higher than ordinary drill bits, preventing cracks and extending the service life. Versatile - Sturdy pointed design The tungsten carbide tip easily penetrates a variety of materials and can drill holes in tiles, concrete, brick, glass, ceramics, plastic and wood Special design - The U-shaped groove design, three flat shanks, can hold the drill bit firmly and stably in the electric drill, and is also suitable for most drill bits. Will not damage tiled walls. SUPERIOR PERFORMANCE - This tungsten carbide tipped drill bit set is sharp, easy to locate, drills stably, quickly, does not break boundaries, and has clean and smooth openings. Hold it firmly so it won't slip, scratch, or damage the tile glaze.Good quality product