Drilax Drill Bit Hole Saw Guide Jig Fixture Vacuum Suction Base with Water Coolant Hole for Tiles, Glass, Fish Tanks, Marble, Granite, Ceramic, Porcelain Guides Holes 8 Different Sizes (5/32" 13/64" 15/64" 1/4" 5/16" 3/8" 15/32" 1/2") Diamond Drill Bits Included New - Improved High Quality Plastic Diamond Hole Saw Drill Guide with Suction Cup Base Integrated Coolant Water Feed Hole Minimum Drill Bit Dimension: 5/32" Maximum Hole Saw Dimension: 1/2" 8 Different Sizes (5/32" 13/64" 15/64" 1/4" 5/16" 3/8" 15/32" 1/2") Diamond Drill Bits Included No tools need, all 8 holes are on the guide, you just secure the guide where you want Perfect Guide for : Ceramic, Glass, Granite, Porcelain or any smooth surface where the suction cup base can hold on to - Including Walls Suction Base Fix Align the hole on the guide to the exact spot where you want to drill and fix the guide using the suction base. Check the drill guide location and make sure the suction is secure. Check twice before starting the hole. Using water as coolant, start the hole. You can spray the water or use the integrated hole. Use the guide until the drill bit (holesaw) makes an initial mark deep enough to keep the bit in position. You can remove the guide and continue drilling.