ROK 48365 3-1/2in Diamond Hole SawDescription mal durability and cutting efficiency, always use a water lubrication system to cool the blade and maintain a reduced drilling speed and pressure. This hole saw is designed exclusively for variable speed hand drills or drill pressesavoid using it with impact drivers or hammer drills. Key Features: Ideal for drilling in ceramic tile, glass, granite, marble, fiberglass, and fiber cement (not suitable for concrete or masonry) Works best with