WIDE COMPATIBILITY: Suitable for 4/5/6/7/8/10/12 mm bits. Drill Holes for Glass, Tile Bottles, Block Pots, Fiberglass Ceramics, Mable Slate, Lightweight Granite, and more; VACUUM BASE: Attaches to most tiled surfaces via its vacuum base suction lever. The suction cup base has good strength to hold the central mask firmly and well on a smooth surface; EASY TO USE: Sturdy handle, easy to move and use. The base of the drill with a strong grip, so that the drill guide does not move, making the operation more smooth. Makes the holes in the tiles more precise; DURABLE PLASTIC: Wear-resistant and durable advanced thickening engineering plastic. Made with high quality sealed bearings for high strength and durability. Easy to store and reuse; PRECISE POSITIONING: Ideal for hard to reach areas such as drilling horizontally into a tiled wall or vertically in floors is much easier with this guide < br>< img src = "https: //m.media-amazon.com/images/I/61E+6bj76dL._SL1500_.jpg" >