JOES Wide 5 Hubs feature a seal retainer ring system which lets you slide in seals for easy maintenance and lower maintenance costs. Hubs can be operated as oil-filled with low-friction bearings or use standard wheel bearings and bearing grease. Wide 5 Hub Kits include races, bearings, rotor flange, seals, spindle nut, and wheel studs. Just add the appropriate dust cover or drive flange to complete the assembly.