Tile Glass Hole Saws Core Bit Guide Adjustable drill guide for tile and glass openings: supports hole sizes from 6 mm to 83 mm (0.24' to 3.27'), covering a wide range of drill needs. Improved drilling control: helps fix the drill angle, with a strong suction to hold the guide in place after positioning, making holes easier and more precise on the chosen spot. Suitable for smooth surfaces: designed for fixing position before drilling on flat surfaces such as glass, tiles, marble, or any smooth surface. Secure suction base: 4.53 inch diameter suction base keeps the guide firmly in place on walls or floors for stability during drilling. Durable materials: made from stainless steel and rubber to ensure long term durability and reliability in various applications. Compatibility and use: intended to work with hole saws and core bits. Use scenarios: Drilling clean, centered holes in ceramic tiles or glass for outlets, fixtures, brackets, or plumbing penetrations. Creating precise holes in marble countertops or glass tabletops to mount hardware or fixtures. Fixing and drilling on smooth surfaces for installations in bathrooms, kitchens, or decorative projects.