Front steer axle hub cap with clear oil inspection window for wheel end lubrication monitoring Die-cast aluminum body in polished finish for corrosion resistance and reduced weight at the wheel end Bolt circle diameter at 4.50" on a 6-bolt mounting pattern for precise alignment on steer axle hubs Oil bath lubrication type with side fill plug for service-friendly oil level maintenance at the wheel end Gasket included for a leak-resistant seal at the hub face flange interface during installation Clear oil inspection window for at-a-glance lubrication level monitoring without disturbing the hub cap