Features: 1. Suit for 4/5/6/7/8/10/12mm drill bits. 2. Designed to drill glass, ceramic tiles, marble. 3. Attaches to most tiled surfaces by means of its lever operated vacuum base. 4. Great for those hard to reach awkward areas like drilling horizontally in tiled wall or vertically in floors is much easier with this guide. 5. Advanced thickening engineering plastic wear-resistant and durable. Made of high quality sealed bearings for high strength and durability. Easy to store and reuse. 6. Rugged grip, easy to move and easy to use. The drill base can be easily attached to a smooth surface with a strong grip, so the drill guide does not move, making your operation smoother. It makes the holes in the tiles more accurate. Specifications: Condition:100% Brand New Material: Carbon steel Color: As shown in the picture Drill Range: 4/5/6/7/8/10/12mm Steps: 1. Check the suction cup and the glass/tile for any debris, to prevent the suction cup from being sucked, and then place the positioner flat on top. 2. Press the black handle flat to absorb it on the glass/tile. 3. Place the drill bit in the hole of the corresponding specification and carefully punch it. Package List: 1* Hole Opening Locator