Wheel hub cap kit with complete hardware for oil bath lubrication systems on commercial trucks Hub cap body in steel and aluminum with a clear poly window for at-a-glance oil level inspection Oil resistant rubber gasket for a leak-resistant seal between the cap flange and hub face Bolt-on mounting type with coated bolt hardware for secure, corrosion-resistant installation Hardware kit contents in hub cap, gasket, bolts, and installation hardware for a ready-to-install solution Leak-resistant sealing design with transparent oil level inspection window for service interval monitoring