Manufactured from heat treated and hardened Chrome Vanadium steel with a fully polished finish. Keys range in length from 90.5 to 231mm. Contents: 1/16", 5/64", 3/32", 1/8", 5/32", 3/16", 1/4", 5/16", 3/8". Anti-slip coating for comfort and control. Supplied in easy-access case for safe storage and quick key selection.