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 software that should seal, to circumvent leakage and make the machines work for prolonged time. Flexible seal is easy to install for you. Product Name : Oil Seal Model : USH Material : Rubber Outside Diameter(Approx.) : 50mm / 1" Inside Diameter (Approx.) : 40mm / 1" Thickness(Approx.) : 6mm / 0" Color : Black Weight : 9g Package Content : 1 x Oil Seal Note: Light capturing and varied exhibits may cause the color of the article within the photo a little bit assorted from the genuine thing. The measurement allowed error is +/- 1-3cm.