This Axle Gasket Set includes 2 high quality seals in the model SD4 30 57 7 and is suitable for the axle end seal needs of many mechanical equipment. Each ring is made of high quality rubber material, the inner ring is fitted with precision spring to ensure a snug fit with the rotary shaft, effectively prevent lubricant leaks and external impurities from entering the outside. The outer diameter of the ring is approximately 2.24 inches (57 mm) and the inner diameter is approximately 1.18 inches (30 mm) and the thickness is approximately 0.28 inches (7 mm) and the size is very precise and easy to install. The metal skeleton construction provides good support strength and ensures that the seals maintain a stable seal performance under high-speed rotations and pressure conditions. This set includes 2 washers at a time, making it ideal for repairing and maintenance applications such as automobiles, agricultural machinery and industrial equipment