This Teng Tools 9-piece Socket Clip Rail Set consists of 1/2inch drive bit sockets for internal TORX heads. The bit sockets are manufactured from chrome vanadium steel for strength and durability and have a satin chrome finish. They are supplied on a clip rail, which is ideal for both wall mounting and for use in a toolbox. The set comprises the following bit socket sizes TX20, TX25, TX27, TX30, TX40,TX45, TX50, TX55, TX60 and one clip rail 220mm (8.2/3in) in length.