Black Steel Construction. Fits wheels 15" & Larger. Axle size 5200-7000lb. Wheel Bolt Pattern 8 Lug on 5.5". Fits Spindle Size #42. 12" 8 Lug on 5.5" Steel Drum. Driver's and Passenger's Side. Works with Al-Ko, Dexter, Lippert and Quality Trailer Axles. Magnet, Pads, Springs, Complete. Adjustable Brakes.