The SKF 4.25" Scotseal Classic Wheel Seal keeps you Ready for the Road Ahead™, as a high-quality, durable seal made of nitrile rubber material, which provides excellent resistance to oils, fluids, and other harsh chemicals from the wheel hub assembly. The housing bore diameter is specifically designed to fit snugly into the wheel housing, helping to prevent leaks and other damage caused by the entry of dirt, debris, and water. This seal is designed to provide long-lasting protection against wear and tear, making it an ideal choice for demanding semi truck applications. Overall, this SKF seal is a top-quality product built to provide reliable protection and long-lasting performance for your wheel system. FleetPride is your First Click in Heavy Duty®.