3 inch Diamond Hole Saw Bit makes a precision cut quick and easy into porcelain tile. 3" diamond hole saw Bit is Electroplated Steel with high diamond concentration will drill tile in corners and close to the edge of tile with precision. Using a drill press will shorten bit life. Cutting into backer-board will shorten bit life. Not for use with Hammer Drills. For use with most types hand-held drills, including cordless drills (800-2500 RPM). For wet use only. Special Order Item.