Innovative thread groove design enhances cooling space, ensuring rapid chip removal to minimize blockages during heavy drilling operations. 4-serrated blade design enables quick positioning and precise drilling in hard materials for efficient and accurate drilling operations. Durable high-hard alloy construction of the four-edged serrated drill bits ensures exceptional longevity and performance, offering a reliable solution for all drilling tasks. Anti-slip hexagonal handle provides a safe and stable grip, enhancing torque transfer for improved control and cutting performance during drilling tasks. Four-blade serrated drills are compatible with various drills, drives, and hand tools, making them suitable for a wide range of materials including stone, concrete, tiles, bricks, wood, marble, and glass with water-cooled tool drilling applications. Item Name: Drill Bit Material: Tungsten Steel Features: High Hardness, Rust Resistant, Long Lasting Size Details: 6 mm, Length: 10cm/3.94" (Approx.) 8 mm, Length: 10cm/3.94" (Approx.) 10 mm, Length: 11.5cm/4.53" (Approx.) 12 mm, Length: 12cm/4.72" (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: Size 6mm, 8mm, 10mm, 12mm: 1 x Drill Bit Or Size 4pcs: 4 x Drill Bits Or Size 6pcs: 6 x Drill Bits