MassMall Diamond Hole Saw - Core Drill for Holes for Tile/Glass/ Marble/Granite / Ceramic/Porcelain / Stone (1/2" + 1") 1. Diamond dust hole saw with 1/4-inch shank 2.The diamond coating on these saws give superior performance and life 3.Set is ideal for drilling clean and accurate holes 4. Great for holes in marble, Slate, Glass, Tile etc.