Agile-Shop Adjustable 1/6" - 3 1/4 Inches Diamond Drill Bit Tile Glass Hole Saw Core Bit Guide With Vacuum Base Sucker Openings Locator Adjustable Hole Saw Drill Guide Jig Fixture with Suction Base - Integrated Water Hole Adjustable Plate for All Sizes of Hole Saws up to 3-1/4" Drill Diameters - Dual Side Plate Removable Ball Bearings - Infinite Configurations - Flip the Plate for Larger Sizes up to 3-1/4" You Can Use the Guide to Start the Hole and Remove the Guide for the Remainder of the Holes Secure The Guide with Suction Base - Feed Water through the Integrated Hole