Item Type: Trailer Hub Bearing Dust Caps Material: Aluminum alloy, rubber Fit for most standard 2000 to 3500 pounds trailer wheel hub for both types of axles EZ Lube and standard. Fit for standard brake or idler trailer axles for most 4 lug or 5 lug axles with 1.98 in diameter cap Package List 4 x Trailer Hub Bearing Dust Caps 1Compatibility: Dust caps is fit for most standard 2000 3500 pounds trailer wheel hub for both types of axles EZ Lube and standard. 2Function: Trailer axle caps are designed to keep the trailer wheels from getting dusty and are not only a simple decoration, but also help you maintain the wheels. 3Strong Sealing: The galvanized bearing dust capsis rust proof and has good sealing and compatibility, long term durability. 4Anti Aging: The dust caps is made of aluminum alloy and rubber, durable, flexible, high toughness, aging resistant, abrasion and tear resistance. 5Practical Tool: Sufficient equipment to meet your daily use or replacement, and is a practical tool for your trailer use.