Osko&reg; 8 Pcs Diamond Hole Saw Drill Bit Set Tools Lot 8 Diamond Dust Hole SAW Drill BIT for Porcelain Glass Marble Ceramic Rock and Granit 3/8", 1/2", 3/4", 1", 1 1/4", 1 3/8", 1 1/2", 1 3/4" 45# Steel Base and Type 3 Diamond,For porcelain, glass, marble, ceramic, rock and granite Size:3/8", 1/2", 3/4", 1", 1 1/4", 1 3/8", 1 1/2", 1 3/4" High quality set is ideal for drilling clean and accurate holes.Use with standard electric or batter Heavy duty hole saws plated with nickel with diamond coating gives superior performance. With Special design of diamond brazing, the edge of saw blade will be free cutting.There is no need