The Drill Bit Hole Locator is an excellent guide for saws or drill bit, you can easily drill clean holes on tile, glass, marble, granite, etc.
With adjustable plates maximum opening length is 3-1/4", large enough to put in all types of sizes.
4 removable bearings can be re-positioned at the 7 bearing holes depending on your need
Suction cup base has good strength to hold the centering jig tight and well on smooth surface
Made of engineering grade ABS plastic, durable quality.
Secure The Guide with Natural Rubber Vacuum Suction Base, Feed Water through the Integrated Hole, help you with sturdy jobs efficiently!
How to Use 1. Adjust the sliding plate for the size of the hole saw - drill bit you want to use. 2. Fix the guide using the suction base exactly where you want to drill the hole. 3. Using water as coolant, start the hole. 4. Use the guide until the drill bit - hole saw makes an initial mark deep enough to keep the bit in position. 5. While drilling, keep using water to cool down the diamond drill bit - hole saw.