... granite, marble, tiles, glass and most masonry. PROFESSIONAL DIAMOND CORE DRILL / HOLE SAW . THESE BITS ARE FROM 8MM DIAMETER TO 55MM DIAMETER. INCLUDING ... ,18,20,22,25,30,35,40,45,50 & 55MM DIAMOND SEGMENT HEIGHT OF 6MM CAN DRILL HOLES TO A DEPTH ... WATER SWIVEL (WHICH YOU WILL FIND IN OUR WEBSITE) Professional Diamond Core Drill ( Hole Saw)