1、Sturdy Construction: Trailer bearing dust cap is made of high strength steel alloy with galvanized surface, ensuring high wear, rust and oxidation resistance for long lifespan. 2、Reliable Protection: The dust cap prevents dust, water, and debris from entering the bearings, protecting against pollution and wear to extend bearing life. 3、Easy Installation: The trailer axle grease cover is suitable for refurbishing and replacing old or damaged dust caps for long term use, convenient and easy to install, saving your time and effort. 4、Versatile Compatibility: The trailer axle hub bearing dust cap fits for 2.72in OD 7000 to 8000lb trailer wheel hubs for various applications, catering different mounting needs. 5、Comprehensive Set: This trailer axle dust cap includes 2 pieces of 2.72in OD trailer bearings dust cap grease cap with rubber plugs, easy and convenient to use and install.