This drill bits can be installed on hand drill, lithium drill, magnetic drill, table drill to achieve better working performance. Adopting alloy materials, these drill bits are very professional for smooth and precise drilling on tiles, marble, porcelain, mirrors and glass. Different specifications can fit your different demands, bring you more convenience. Features -Color:Assorted Color -Material:Alloy. -Size:10.00X5.50X0.50cm,11.00X6.50X0.60cm,12.00X7.50X0.80cm,12.00X7.50X0.80cm/3.93X2.16X0.20in,4.32X2.55X0.24in,4.72X2.95X0.31in,4.72X2.95X0.31in. - Specification: 6mm, 8mm, 10mm, 12mm. - Made of alloy material, these drill bits are sturdy, wear-resistant, durable for longer servicing time. - Aimed for quick and accurate drilling, saves much time and effort, different specifications can meet different drilling accuracy. - Applied for glazed tile, antique tile, foams tile, bubble tile, red brick, concrete, wood, plastic, vitrified tile, ceramic tile, marble and so on. - The hole diameter will not expand, has precise positioning, will not be offset for better and safer using. - Acute, it has high hardness and stable working performance, high-speed operation to improve working efficiency. Package list: 4 x drill bits(6mm) 2 x drill bit(8mm) 2 x drill bit(10mm) 2 x drill bit(12mm)