Heavy duty casters wheels are made of high-quality polyurethane material, galvanized steel wheels. caster wheels have strong abrasion resistance.In contrast, it is the best material wheel of its kind. Industrial caster wheel diameter: 4,5,6,8 inches, width: 2 inches,hole size 1/2 inches. wheel can support load 800-1500lb/pcs.The Heavy Duty Polyurethane wheels s run smoothly. The Wheels can replace at Swivel Casters, such as platform carts,shopping carts, furniture, pallet trucks, inventory carts, trolleys, luggage carts, workbenches, and so on.