APPLICABLE DRILLS: Diamond drills are suitable for 4 or 5 or 6 or 7 or 8 or 10 or 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 percent brand new Material: carbon steel Color: as shown in picture Drilling range: 4 or 5 or 6 or 7 or 8 or 10 or 12 mm Steps: 1. Check the suction cup and glass or 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 or tile. 3. Place the drill bit in the corresponding specification hole and drill it carefully. List of packages: Hole opening locator 1 x Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.