Rubber oil seal is designed for hydraulic equipments use. High tear, temperature and corrosion resistance. Widely used in automobile, mechanical equipment, engineering machinery, chemical, ship, hydropower station, aviation field, can be used for equipments like pump, hydro-cylinder or other hydraulic application that need to seal, to avoid leakage and make the machines work for long time. Flexible seal is easy to install for you. Product Name : Oil Seal Model : USH Material : Rubber Outside Diameter(Approx.) : 50mm / 1.96inch Inside Diameter (Approx.) : 40mm / 1.57inch Thickness(Approx.) : 6mm / 0.236inch Color : Black Weight : 9g Package Content : 2 x Oil Seal Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.