Protect your rims against theft with the Carpoint wheel nut locks. These lock nuts can only be removed with the special key provided. The set comes with 4 wheel nut locks and special key. Type F. Size: M12x1.5 Convex Conical. Always check if the wheel bolt locks are the same as the current bolts. An incorrect size of bolt (too short, too long or not the right size) can cause damage.