Heavy-Duty Protection for Your Trailer Bearings Whether you're gearing up for a cross-country RV trip or launching your boat for the season , the AOHIEDI Trailer Axle Dust Caps provide the ultimate defense against road debris, mud, and contamination. Designed specifically for 2,000-3,500 lb axles with a standard 1.98" hub diameter , these caps ensure your wheel bearings stay lubricated and protected mile after mile.Built to Last in Harsh Environments Crafted from high-strength carbon steel with a premium zinc-plated finish, our dust caps are engineered for superior corrosion resistance in freshwater and highway conditions. The heavy-duty construction resists denting during installation , while the tight interference fit ensures they stay securely in place even at highway speeds.EZ Lube Compatible & Extra Value Maintenance has never been easier. These caps feature a pre-drilled center hole designed for EZ Lube axles , allowing you to grease your bearings without removing the entire hub. We include extra high-quality rubber plugs in every pack , giving you the peace of mind of having spares ready for emergency roadside replacements.Important Sizing Note To avoid common fitment issues, please measure your existing hub diameter with a caliper before ordering. These caps are an exact 1.98" fit; even a 0.01" difference can affect installation. For first-time users, we recommend using a 2x4 wooden block and a mallet to tap the caps into place evenly for a professional seal.