King pin kits for the steering axles of trucks, buses, trailers and passenger vehicles. The king pin is the pivot on which the steering knuckle turns, and a kit renews the pin together with the parts that wear around it, restoring steady steering. The kits contain a long steel king pin with its bushes, a thrust bearing, an oil seal, a set of shims and O-rings, circlips, a lock pin and a gasket. Kit contents vary by version, with plain white bushes in one set and bronze-coloured bushes in another.