Due to the hard material used in this drill bit, it has high hardness, strong toughness, and wear resistance, which has a long service life. Moreover, it is equipped with cross, triangular, or threaded drill bits to meet more needs. Featuring a hexagonal shank design, this drill bit has the advantages of stable connection, less slippage, and firm clamping, making it easy compatible you to operate. Also, it adopts a double spiral chip discharge groove design, which can effectively prevent accumulation and improve efficiency. It is constructed of alloy material. There are 4 sizes compatible your reference. It is suitable compatible glass, ceramic, tile, mirror, plant pots, wood, porcelain, brick wall, marble, thin iron plate, etc. Item Name: Drill Bit Material: Alloy Features: High Hardness, Good Toughness, Abrasion Resistant Size Details: 10 mm, Diameter: 1cm/0.39", Length: 11.4cm/4.49"(Approx.) 6 mm, Diameter: 0.6cm/0.24", Length: 9.7cm/3.82"(Approx.) 8 mm, Diameter: 0.8cm/0.31", Length: 11.4cm/4.49"(Approx.) 12 mm, Diameter: 1.2cm/0.47", Length: 11.4cm/4.49"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Drill Bit