【Adjustable Drill Guide】: This versatile Tile Glass openings Locator features an adjustable hole drill guide that accommodates sizes from 0.16inch-3.27inch, making it ideal for a variety of drilling needs 【Secure Suction Base】: The suction base of the Tile Glass Hole Saws Core Bit Guide ensures the guide stays firmly in place on your desired drilling place, providing stability and precision whether you're working on walls or floors 【Efficient Water Drainage】: Designed with double drainage slots on either side of the Glass Ceramic Tile Hole Opening Locator, it allows for effective water management during use, enhancing performance and reducing mess 【Material】: The Glass Ceramic Hole Drill Guide is made from alloy and plastic materials to ensure long term durability and reliability in various applications 【Function】: This  Hole Drill Locator helps you fix the angle, has strong suction, and is much more convenient to drill holes after the position is determined. It is suitable for fixing the position before drilling holes on flat surfaces such as glass, tiles, granite, or any smooth surface Specification: Adjustable: 4mm-8.3cm/0.16inch-3.27inch Package Includes: 1 Tile Glass openings Locator Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.