Produced To Exact OE Dimensional Specs To Meet Or Exceed OE Form, Fit And Function. Machined Rubber Sealing Edge Provides Better Sealing Surface. Flanged Design Allows For Easy Installation And Helps Avoid Cocking. Extra Dust Boot Lip Helps Keep Harmful Contaminants Out Of The Bearing, While Protecting Against Rust And Corrosion. Latex Core Seals The Outer Diameter Leak Path And Compensates For Minor Bore Imperfections.