Equip your semi truck to be Ready for the Road Ahead™, with the Stemco 3-1/2" Axle Hub Cap Window Kit, a key piece that allows operators to easily inspect a hub's internal components. This replacement component features a transparent design, allowing for seamless visibility to check bearing conditions, lubricant levels, or oil quantities. Manufactured with corrosion resistant and durable materials. FleetPride is your First Click in Heavy Duty®.