Knurled ring for extra grip with oily fingers. Supplied with socket rail. Model No AK2675. Type: 1/2″Sq Drive – Imperial. Set supplied on socket rail. Contents: 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″, 1-1/16″, 1-1/8″, Socket Rail.