The Blue Spot Tools 10 PCE Locking Wheel Nut (18-25mm) is manufactured from tempered and heat-treated chrome vanadium with a blackened phosphate coating to protect against corrosion. The nut remover set is ideal for those who have lost their security sockets as the sizes cover those most frequently used in the automotive industry. The set can also be used to remove corroded or damaged bolts. The sandpaper is used for internal deburring of the socket after use.