s The diamond hole saw is made of high carbon steel with clean and smooth opening, no broken edges. Small incision resistance, stable drilling, and won't break the border. Good Design Center pilot holes and side holes help to easily dispose of waste. The diamond drill bit has a golden coating to prevent rusting and improve surface corrosion resistance. Wide Application Diamond drill bits can be used to drill ceramic tile, marble, glass, granite, concrete, and other hard materials. Compatible with all electric drills and hammer drills. Ideal for DIY projects and home maintenance and repair. Please Note When cutting hard materials, ensure the bit stays cool to prevent damage to the material and premature wear. Use water for lubrication during drilling to extend the life of the bit. Buy with Confidence We offer a two-year warranty on the hole saw. If you have any questions, please . We will do our best to assist you. (Please clamp the shaft properly and take necessary protective measures during use.) Diamond Hole Saw Drill Bit Primarily used for drilling faucet mounting holes in stone countertops or plumbing lines in showers and vanities. Marble Hollow Drill Bit Long lasting, made of high carbon steel for quick and precise piercing with extended life. High Carbon Steel Blade Sharp and smooth, provides small incision resistance, stable drilling, and clean, smooth openings without chipping edges. Gold Coating Durable construction with gold-coated finish to resist rust. Features Material: High-grade carbon steel Size: 55mm diameter Package Includes: 1 x Diamond hole saw drill bit Suitable for: Glass, ceramic tiles, porcelain tiles, marble, granite, reinforced concrete, and other hard materials Compatible Tools: Hand drill, drill press Note: Keep the tool cool with water or lubrication during use to prolong its life.