Selling wheel hubs for trailers in China. The materials are ductile cast irons or steels. Galvanized Hubs, 4-5 studs. PCD 4" or 4.5" .Bearing type is roller. Axle capacity 750kgs,1000kgs,1500kgs,etc.Surface treatment: spray-painting or zinc-plated. If you are interested in wheel hubs for trailer, Pls contact us .