The BlueSpot 5 Pce Locking Wheel Nut Remover Set is manufactured from tempered and heat treated chrome molybdenum steel with a blackened phosphate coating to protect against corrosion. The locking wheel nut has a deep internal reverse thread, which grips the outside of a wheel nut, allowing its removal. The nut remover set is ideal for those who have lost their security sockets as the four sizes cover those most frequently used in the automotive industry. The set can also be used to remove corroded or damaged bolts. The remover set has a 1/2" square drive so can use used in conjunction with most hand, power and air tools. The set contains: 17mm, 19mm, 21mm, 22mm and 12mm straight drift bar. Set supplied in robust plastic carry case for easy storage and transportation.