CAN DRILL HOLES TO A DEPTH OF 45MM in granite, marble, tiles, glass and most masonry. PROFESSIONAL ... ,40,45,50 & 55MM DIAMOND SEGMENT HEIGHT OF 6MM CAN DRILL HOLES TO A DEPTH OF 45MM in granite, marble, tiles, glass and ... on the larger sizes THEY ARE ALSO HOLLOW FOR THE USE OF A WATER SWIVEL (WHICH YOU WILL FIND IN OUR WEBSITE) Professional ...