RemGrit, 2-1/2" 1 Piece Hole Saw, Cuts Ceramic Tile, Marble, Slate, Fiberglass, Laminates & Composites, Patented Design, No Separate Mandrel Or Pilot Drill Needed, Tungsten Carbide Grit Cutting Edge, Continuous Edge Design, Produces Exceptionally Smooth Cuts, No Teeth To Dull Or Chip, 1" Depth Of Cut, Perfect For Do-It-Yourself Ceramic Tile Projects.