HIGH-QUALITY DIAMOND DRILL BIT RUST-PROOF & QUICK CUTTING - Made of high-strength carbon steel with nickel-plated surface, which makes these drill bits durable and precise; the tip of the drill is evenly coated with 80 grit diamond; this greatly helps to improve faster and cleaner drilling than other common hole saws. Pack of 10 most common sizes: includes the following diameters: 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 50mm. With laser marking, the size will meet most of your different needs. Application: Suitable for drilling glass, marble, ceramic tile, glass brick, fiberglass, porcelain, tiles, slate, granite, light stone, etc. Suitable for all electric drills and hammer drills. Beautiful design: Center pilot hole and side holes help clear debris easily; and the nickel-plated surface prolongs life and improves surface corrosion resistance. Note: When cutting hard materials, it is important to ensure that the tool is kept cool to avoid damage to the material being
