Hardened and tempered high quality alloy steel bits. Precision machined cutting tips for fast and effortless cut. Designed to make professional and clean flat holes in wood. In blow mould case for safe storage. Sizes: 1/4" (6mm), 3/8" (10mm), 1/2" (13mm), 5/8" (16mm), 3/4" (19mm), 7/8" (22mm), 1" (25mm), 1 1/8" (28mm), 1 1/4 (32mm), 1 3/8" (35mm), 1 1/2" (38mm), 1 5/8" (41mm), 1 3/4" (44mm), 1 7/8" (48mm), 2" (51mm), 2 1/8" (54mm). Also, 6-10mm shank is supplied in plastic carrying case.