If you are looking for some professional drill bits, then your research is over here. That's because our products can satisfy your demands. Using steel material, it is practical for . Light weight, it is easier to use and bring you much convenience in drilling tile, glass, concrete by the help of electric drill. Features - Color: Black. - Material: Steel. - Size: 12.30X1.20X1.20cm/4.83X0.47X0.47inch. - Specification: 4mm, 5mm, 6mm, 8mm, 10mm, 12mm. - Using cemented carbide material, it is safe and practical for long servicing time. - Adopts excellent and craftsmanship, and the drill bit is carefully polished, has good texture. - Easy to install without slipping, can be matched with different kinds of drills to fit your needs. - They are practical tools widely used for drilling ceramic tiles, concrete, glass, marble, aluminum alloy, etc. - Hard and tough, and it is more durable and wear-resistant, not easy to deform or break, offer you safer using. 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)