When you take your trailer through some pretty dusty or dirty areas, your brake system is more likely to get debris inside of it, and that can spell trouble. Not only will the parts wear out faster, but worst of all the strength of your brakes can become compromised. That's when it's best to have this torsion arm assembly on your marine trailer. This assembly utilizes the VAULT "Hybrid Lubrication System", which provides you with the ultimate in wheel bearing protection and lubrication. It's so well designed and built that there's no inspection, no maintenance, and no service required. This rugged rotor and caliper assembly is fully sealed, and is made to carry loads up to 3,700 pounds (1,678kg). For use with wheels with 5 holes for lug nut posts. SkipperMate Marine is the best choice you can make when you're shopping for parts for your marine trailer.