Neiko Heavy Duty 5-Piece Diamond Dust Hole Saw, Tile Glass Marble slate Tool
Neiko 5-piece 5/32 to 1/2-inch diamond dust hole saw set.  1/4-inch shank size, saw sizes: 5/32, 1/4, 5/16, 3/8 and 1/2-inch.  Heavy duty hole saws plated with nickel with diamond coating gives superior performance on ceramic tile and similar material.