Specifications: This drill bit combines the characteristics of ceramic head and electric hammer drill. It is grooved on ordinary ceramic drills, which is more conducive to ash discharge. The drill bit is made of hard alloy, which is more hard and will not damage the porcelain wall. They can be installed in ordinary hand drill, charging drill, bench drill, impact flat drill, etc. Item Name: Drill Bit Material: Alloy Features: Durable, Triangle Shank, Electric Drill Accessories 6mm Size: Total Length: 10cm/3.94", Working Length: 5.3cm/2.09", Shank Diameter: 4.5mm/0.18" (Approx.) 8mm Size: Total Length: 11.2cm/4.41", Working Length: 6.5cm/2.56", Shank Diameter: 6mm/0.24" (Approx.) 10mm Size: Total Length: 11.2cm/4.41", Working Length: 7cm/2.76", Shank Diameter: 7.5mm/0.30" (Approx.) 12mm Size: Total Length: 12.1cm/4.76", Working Length: 7cm/2.76", Shank Diameter: 9mm/0.35" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Set of Drill Bit(6/6/8/10/12mm, Total 5Pcs) Or 10 x 6mm Drill Bits Or 10 x 8mm Drill Bits Or 5 x 10mm Drill Bits Or 5 x 12mm Drill Bits