... Step Drill Hole Saw for Water Drilling, with Trigonal Shank-Fast, clean and efficient way to core holes in counter tops.- ... your requirement (6). Used to drill marble, ceramics, porcelain, tile, glass, fiberglass, quartz, bricks, and a variety of other materials ... It is very easy to assemble and use with or without center pin. Drill: Step Drill Hole Saw for Water Drilling, with Trigonal Shank