... OF 45MM in granite, marble, tiles, glass and most masonry. PROFESSIONAL DIAMOND CORE DRILL / HOLE SAW . THESE BITS ARE FROM 8MM ... DIAMETER TO 55MM DIAMETER. INCLUDING 8,10,12,16,18,20,22,25,30,35,40,45,50 ... A WATER SWIVEL (WHICH YOU WILL FIND IN OUR WEBSITE) Professional Diamond Core Drill ( Hole Saw)