Ladder & adjustable scaffolding caster Fork:Zine plated, Hollow screw stem Wheel:PU Tyre + PP Rim Loading capacity: 250-300kg Fork:housing-welded and hollow screw stem,zinc-platedWheel: PU Tyre + PP Rim,plain bearingLoading capacity:250-300KGWheel size:152*50MM,203*50MMOptional wheels: PU wheel (nylon core),nylon wheel(PP core),nylon wheel Ladder & adjustable scaffolding caster