3/16" Porcelain and Glass Tile Carbide Drill Bit

3/16" Porcelain and Glass Tile Carbide Drill Bit The PTC Porcelain Tile-Glass Hole Cutter is a revolutionary new drill for use on Class 5, the toughest industrial porcelain and residential wall and floor tile. Also works effectively on granite, marble and glass. A constant flow of water must be used. It outlasts other drills and requires less operator pressure while drilling thus eliminating burning or cracking of tiles or glass. Fits standard power drill chucks. Cooling of drill tip by water during drilling is required. Run at 700-900 RPM's.