4 1/4" Diamond Hole Saw For Shower Diverter Valve and Toilet Flange The Diamond Hole Saw Guide Holds The Hole Saw In Place When Drilling, Pro Grade Multi Use Large Gauge Diamond Grit Hole Saw With Drill Guide For Straight Holes. The 4 1/4" Diamond Hole Saw Drill Bit Template makes it easy to use the 4 1/4" Diamond Hole Saw For Tile Porcelain Granite Ceramic and Glass Tile 108mm. Using Water with the 4 1/4 In Diamond Hole Saw for Ceramic Tile and Stone is a must.