Trailer owners, this 4-set hub bearing kit is exactly what you need for maintaining or repairing your 6000-7000lb capacity trailer axles. Each set includes everything required for one wheel: 15123/15245 and 25580/25520 bearings, double lip grease seals (21333TB/10-10 and 22333TB/10-36), tang washers, and cotter pins. The steel alloy construction is built to handle heavy loads and harsh conditions without failing. The stamped steel cages keep the rollers perfectly spaced for smooth, quiet rotation even at highway speeds - no more annoying bearing noise from your trailer. The reinforced spring behind the lip seal does an excellent job retaining grease inside while keeping water and road dirt out, which significantly extends the life of your hubs. Whether you're doing routine maintenance, rebuilding old axles, or replacing damaged components, having these quality bearing kits on hand saves you from costly downtime. The precision manufacturing ensures excellent spindle support that reduces friction and improves your trailer's overall efficiency. With four complete sets, you can service multiple trailers or have spares for future needs. If you rely on your trailer for work or recreation, proper wheel bearing maintenance is crucial for safety and reliability. This kit gives you quality components that will keep your trailer rolling smoothly for thousands of miles.