
PREMIUM MATERIAL: The drill bits are made of high-quality tungsten carbide, and their hardness is higher than ordinary triangular drill bits on the market. DURABLE DRILL BITS: The reinforced tip head allows one drill to be used dozens of times. When you use it for drilling, using water for lubrication would be better. WIDELY USED: Especially suitable for metal due to its superior hardness. Also for ceramic tiles, wood, ceramic, stone, concrete, brick, marble, glass, etc. TRIANGLE SHANK: The triangular shank, which is suitable for most drills, can be a better clamping of the electric drill to prevent wandering and slipping.