Set of 4x 14mm Lug Nuts, Studs & Washers or Set of 5x 12mm Lugs, Studs and Washers. Studs are stepped from 12mm or 14mm to 1/2-20. Lugs are 1/2-20. Usually used with Mag wheels. Sets mean 1 set is enough for 1 drum. There are 4 in a 14mm kit and 5 in a 12mm kit. If you have a 14mm 5 Lug Drum you will need 5 sets for a whole car.