Teng Tools 1/2" TX Cylinder Head Bit Socket TX55. 1/2" drive long reach TX55 bit socket. 125mm overall length for use on cylinder head bolts. Chrome vanadium. S2 steel bits pressed in to the socket. Satin finish for a better grip when handling the socket. Retention groove for ball detent that secures the connection of the socket to the drive end or power bar. Designed for use with fastenings with a TX hole. Supplied with a metal socket clip for use with a socket rail.