The dry drilling bit set is convenient and practical, with excellent texture, and can serve you for a long time without being easily . The craftsmanship can serve you well without breaking easily. This is a very practical dry drilling bit set. Features -Color:Blue -Material:Alloy -Size:1.20X0.82X0.82cm/0.47X0.32X0.32in Hole diameter: 5mm, 6mm, 8mm, 10mm, 12mm Hole depth: <= 30mm Rod diameter: 4.5mm(5mm), 5.2mm(6mm), 7.3mm(8mm), 8.3mm(10mm), 8.2mm (12mm) - Made of high grade alloy, high hardness, acute and durable. The bit is more stable due to the overall forging. - Internal sealing wax treatment, cutting and cooling can be dry, longer use. - The tail adopts , which is suitable for a wide range of applications, such as angle grinders, hand drills, etc. - Perfect for drilling holes in hard materials, especially tiles, porcelain floors, granite ceramic glass mirror marble masonry tiles. - Outstanding workmanship, reasonable design, stable and practical, will bring you a . Package list: 1 x 5mm drill bit 1 x 6mm drill bit 1 x 8mm drill bit 1 x 10mm drill bit 1 x 12mm drill bit