TA-VIGOR 18mm Diamond Drill Bit Glass Hole Saw Set, Hollow Core Drill Bit with Spotting Drill Bit, Tile Hole Cutter Set Core Drill Bits Center Pilot for Ceramics Porcelain Tile Bottles Pots Brick

Rustless & Durable: Made of high strength Carbon Steel with smooth nickel plating surface to extend the service life, which are high quality and good performance that excellent for making clean and accurate hole. Quick, Sharp & Smooth Cut: Coated with high quality Diamond to enhance the drilling speed and creates a sharp, high precision and smooth cut with no broken edges In Seconds. Application: Drill Glass, Tile Bottles, Blocks Jars, Fiberglass Porcelain Tile Ceramic, Slate Mable, Granite Light Stone. Will work with electric drill and impact drill. Attention: Please keep the speed in 800-1000 per minute, keep adding water to keep the drill cool, strictly prohibit from dry drilling. Clearance Hole: Diamond drill bits along with clearance hole facilitate the entrance of cooling water and escape of chips from drilling. Makes drilling process easier.