Master Mechanic, 10 Piece, Rotary Masonry Drill Bit Set, Carbide Tip Geometry For Speed and Durability, For Use On Standard Drills, Includes: .1875 inch , .125 inch , 2.1563 inch , 2.1875 inch , .25 inch , .3125 inch , .375 inch and .5 inch , Organized In A Durable Case, Clamshell.