Master Mechanic, 10 Piece, Rotary Masonry Drill Bit Set, Carbide Tip Geometry For Speed & Durability, For Use On Standard Drills, Includes: (3) 1/8",(3) 3/16", (2) 1/4", (1) 3/8" & (1) 1/2", Organized In Durable Case, Clamshell.