Swivel castor for loading on industrial floors, fork plate in pressed galvanized sheet steel with 1 (= 50-65 mm) or 2 (= 80-200 mm) ball ring(s), plastic (polypropylene) rim (wheel body), black rubber tire 80 - 200 mm = bolted axle with nylon protection for ball ring 160 - 200 mm = axle hole with metal roller bearing