Hardened and tempered Trx bits with satin finish, mounted in polished chrome vanadium square drive socket. Contents: 1/4″ drive T10, T15, T20, T25 and 3/8″ drive, T27, T30 and T40. Hardened and tempered Trx bits with satin finish, mounted in polished chrome vanadium square drive socket. Contents: 1/4″ drive T10, T15, T20, T25 and 3/8″ drive, T27, T30 and T40.