Special socket for removing and installing of diesel injectors. Set contains: 1 pc 1/2" Dr. x 22mm(6 point ), 110mm long. 1 pc 1/2" Dr. x 22mm(12 point ), 80mm long. 1 pc 1/2" Dr. x 27mm(12 point ), 80mm long. 1 pc 1/2" Dr. x 28mm(12 point ), 78mm long.