If you are in search of some professional drill bits, then your research is over here. That's because our products can satisfy your demands. Made of alloy material with detailed workmanship, it is very sturdy and practical for longer service period. Light weight, it is easier to use and bring you convenience in drilling tile, glass, concrete by the help of electric drill. 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. - Using safe and sturdy alloy material, this drill bit kit is reliable and practical for long servicing time. - Adopts excellent and detailed craftsmanship, and the drill bit is carefully polished, has excellent texture. - The drill sleeve adopts spiral design to facilitate drilling and improve drilling efficiency, bring you convenience. - They are practical tools widely used for drilling ceramic tiles, concrete, glass, marble, aluminum alloy and more. - Hard and tough, and it is more durable and wear-resistant, not easy to deform or break, provides you safer using feeling. Package list: 6 x drill bits(6mm) 3 x drill bit(8mm) 3 x drill bit(10mm) 3 x drill bit(12mm)