HHDGUIDE Suction Cup / Drill Bit Hole Saw Guide Jig with Bearing. Drill Bit Hole Saw Guide Jig Fixture with Vacuum Suction Base & Water Coolant Hole; for Tiles, Glass, Fish Tanks, Marble, Granite, Ceramic & Porcelain. Capacity: 1/8’’ to 3-1/4’’ Diamond Hole Saw/Drill Bits. Features: 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 Bearings - Infinite Configurations - Flip the Plate for Larger Sizes up to 3-1/4" Secure The Guide with Suction Base - Feed Water through the Integrated Hole 1/8" to 1-3/4" Diamond Hole Saws Use Plate Face A without Bearings 7/8" to 3-1/4" Diamond Hole Saws Use Plate Face B with Bearings Instructions: Adjust the sliding plate for the size of the hole saw - drill bit you want to use. Once side of the plate is for sizes up to 1-3/4" and flip the plate for larger sizes up to 3-1/4". Fix the guide using the suction base exactly where you want to drill the hole. Check the drill guide location and slider position before you start drilling. Using water as coolant, start the hole. You can spray the water or use the integrated hole. Use the guide until the drill bit - hole saw makes an initial mark deep enough to keep the bit in position. You can remove the guide and continue drilling. While drilling, continuous water use required to cool down the diamond drill bit / hole saw has been a factory direct distributor of power tools, accessories, fittings and shop machinery since 1986.