Function: The Hole Drill Guide fixes the drilling angle, provides strong suction, and makes drilling holes after the position is determined more convenient. It is suitable for securing the position before drilling on flat surfaces such as glass, tiles, marble, or any smooth surface. Material: The Glass Ceramic Hole Drill Guide is crafted from stainless steel and rubber to ensure long term durability and reliability in a variety of applications. Secure suction base: The 4.53 inch diameter suction base keeps the guide firmly in place at your chosen drill site, delivering stability and precision whether you are working on walls or floors. Adjustable drill guide: The Tile Glass Hole opening features an adjustable hole drill guide that accommodates sizes from 6 mm to 83 mm (0.24 to 3.27 inches), making it suitable for a wide range of drilling needs. Applications and compatibility: Designed for use on glass, ceramic tiles, marble, and other smooth surfaces. Ideal for openings and holes required for fixtures, hardware mounting, or wiring in smooth materials. Use scenarios: Drilling precise holes in glass shower enclosures or glass countertops for fittings. Creating clean, accurately sized openings in ceramic tile backsplashes for outlets or plumbing fixtures. Marking and drilling holes in marble or other smooth stone surfaces for hardware mounting. How to use: Clean and prepare the surface, position the guide, press the suction base to secure, select the appropriate hole size, and drill with the appropriate bit.