This 5-piece 1/2" drive twist socket set from Neilsen is designed for removing deformed or damaged nuts. The set includes four twist sockets with sizes 17mm, 19mm, 21mm, and 22mm, all 150mm long. It also comes with a 12mm diameter x 150mm long punch bar. The sockets are specifically designed to grip and remove wheel nuts that are rounded or damaged. The set is supplied in a convenient storage and carrying case.