General description High-quality diamond drill bits designed for efficient and fast cutting. Made from high-strength, nickel-plated carbon steel, these durable and precise drill bits feature a uniform 80-grit diamond coating that significantly increases drilling speed. This set includes 10 pieces with various diameters, making it suitable for a wide range of applications. Technical specifications Material: Nickel-plated carbon steel Diamond coating: 80-grit Sizes included: 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, 22 mm, 25 mm, 50 mm Compatibility and accessories Compatible with all electric drills and hammer drills Installation Start the hole diagonally to make a circular mark, then drill Usage Suitable for drilling holes in glass, marble, tiles, cement pots, fiberglass, porcelain, ceramic tiles, slate, light granite, and more Always use water as a lubricant during drilling to prevent overheating and extend the service life of the drill bits When cutting hard materials, ensure