Use the QEP 1/4" (6 mm) Diamond Hole Saw to drill holes for bathroom pipes in glass, stone, marble, granite and porcelain tile, as well as concrete (depending on thickness). In addition to the 1/4" hole saw, the kit contains water reservoir, drill guide, and adhesive pads for mounting. This hole saw must be used with the water reservoir to keep it from overheating and must be used with a cordless drill. Only for wet use with cordless drills. Up to 8 uses.