APPLICABLE DRILLS: Diamond drills are suitable for 4/5/6/7/8/10 / 12 mm drills. APPLICABLE MATERIALS: The drill bit locator is designed for drilling glass, tile and marble. LEVER OPERATION: It is secured to most tile surfaces by its lever operated vacuum base. FUNCTION: For hard-to-reach areas, for example when drilling horizontally into a tiled wall or vertically into the ground, it's very simple. HIGH QUALITY MATERIALS: High quality thick engineering plastics are durable and long lasting.Made of high quality sealed bearings with high strength and durability.Easy to store and reuse. Product description Condition: 100% brand new Material: carbon steel Color: as shown in picture Drilling range: 4/5/6/7/8/10/12 mm Steps: 1. Check the suction cup and glass / tile for any debris to prevent the suction cup from being sucked in, then place the positioner flat on top. 2. Press the black handle flat to absorb it onto the glass / tile. 3. Place the drill bit in the corresponding specification hole and drill it carefully. List of packages: Hole opening locator 1 *