This drill bits can be installed on hand drill, lithium drill, magnetic drill, table drill to have better working performance. Adopting steel materials, these drill bits are professional for smooth and precise drilling on tiles, marble, porcelain, mirrors and glass. Different specifications can fit your different needs, bring you much more convenience. Features - Color: Black. - Material: Steel. - Size: 12.30X1.20X1.20cm/4.83X0.47X0.47inch. - Specification: 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. - Made of steel material, these drill bits are sturdy, wear-resistant, durable for longer service time. - Aimed for quick and accurate drilling, saves time and effort, different specifications can satisfy different drilling accuracy. - Widely applied for glazed tile, antique tile, foams tile, bubble tile, red brick, concrete, all kinds of wood, plastic, vitrified tile, ceramic tile, marble, etc. - The hole diameter will not expand, has precise positioning, will not be offset for better using. - Effectively prevent the accumulation of chips, high-speed operation to improve working efficiency. Package list: 1 x drill bit(4mm) 2 x drill bits(5mm) 3 x drill bits(6mm) 2 x drill bits(8mm) 1 x drill bit(10mm) 1 x drill bit(12mm)