General description This Glass Tile Hole Finder Drill Guide is designed for precise drilling and positioning of holes in glass, ceramic tiles, marble, and ceramics. It features a strong suction cup that securely attaches to the surface, ensuring stability during use. Technical specifications Drill bit size range: 4-83mm Material: Diamond drill bit Usage Ideal for drilling holes in glass and tiles. Utilizes a rolling sliding design for easy positioning of drill bits of various sizes. Includes a positioning hole opener to prevent drill slipping.