Trailer Axle Wheel Hub and Bearing Dust Cap are made of high quality carbon steel and rubber, surface zinc plated, strong and durable, not easy to deform, corrode or rust Dimension: OD: 1.98 inch/ 50.4 mm; Please check the size information and compatibility carefully before placing an order Fitment: Fit most standard 2000 -3500 pounds trailer wheel hub for both types of axles EZ Lube and standard. Fit standard brake idler trailer axles for most 4 lug 5 lug axles with 1.98" diameter cap Package Include: 4pcs 1.98 inches trailer axle covers with 4pcs extra rubber plug; The extra 4 rubber plugs can be used as spare parts in case of emergency The trailer axle cap is designed to avoid the trailer axle from dust, preserve the grease, prevent axle corrosion and as decoration. Hub grease caps are designed with removable rubber plugs, easy to install and maintain Product Description 1.98" Trailer Axle Dust Cap with Rubber Plugs - 4PCS Fitment Fits Most 2000-3500 Pound Axles Fit standard brake idler trailer axles for most 4 lug 5 lug axles with 1.98" diameter cap Package Include 4pcs 1.98 inches trailer axle covers 4pcs extra rubber plug Dimension OD: 1.98 inch/ 50.4 mm The trailer axle cap is designed to avoid the trailer axle from dust, preserve the grease, prevent axle corrosion and as decoration Hub grease caps are designed with removable rubber plugs, easy to install and maintain In order to install firmly, the axle dust cap is slightly larger by design. You need to knock it into place using a wood block and hammer or rubber mallet, to prevent denting the cap while installing