Jamiikury 3-Piece Diamond Hole Saw Set - 12mm, 19mm, 25mm Glass & Tile Drill Bits for Ceramic, Porcelain, Marble - Perfect for Bathroom Renovation, Kitchen Backsplash & DIY Home Projects

Features: 1. The diamond drill bit is made of industrial-grade carbon steel and plated with a nickel coating to enhance the corrosion resistance. 2. The high quality diamond coating improves the hardness, sharpness and cutting speed of the drill bit and realizes a smooth, high precision cutting edge without damage. 3. The large clearance hole on the side of the drill bit facilitates the pouring of cooling water and the escape of chips during operation, making the drilling process easier. 4. The small hole above the hole cutter helps us pull out the debris stuck in the hole saw with a screwdriver. 5. Suitable for Glass, Tile, Fiberglass, Porcelain Tile, Ceramic, Slate Mable, Granite Light Stone. Not for use on Concrete. Specification: Color: Silver Material: High quality steel & Diamond Sand Hole Diameter: 15/32"(12mm), 3/4"(19mm), 1"(25mm) Package Included: 3 x Diamond Hole Saw Drill Bit Warm Tips: 1. Please keep adding water to keep the drill bit cool and increase lubricity during working. 2. Keep the drilling speed at 800-1000 per minute to reduce the drilling pressure, which can greatly extend the service life of the drill bit. 3. Dry drilling is strictly prohibited for this product. 4. Since the product is measured by hand, please allow a difference of 1-2 mm, thanks! 5. Our image is as consistent as possible with the real object, but due to the equipment, display and light, the color of the two is slightly different.