Big Iron Model Rear Wheel Truck Hub Cover Kit Chrome plated ABS/PC plastic rear wheel hub covers with removable center caps and ten flat top hex 33mm x 2 3/4" thread-on nut covers Unique, large, fluted design with 50% more surface area and shine than traditional hub covers Specially designed locking tab secures thread-on nut covers holding axle cover to the wheel Ventilation holes in the hub cover to prevent heat build-up Matching front axle cover sold separately, item QS23-2050-D-001