Caster SIZE: Industrial caster diameter: 4,5,6,8 inches, width: 2 inches, top plate: 4x 4-1/2,with Needle roller bearing, One caster wheel Load capacity is 800-1200lb,one set of 4 load Capacity will be 3200-4800LB The heavy duty casters are made of high-quality polyurethane molds, bright galvanized steel wheels and yokes. The caster wheels have strong abrasion resistance, are not easy to rust, and have strong shock absorption and buffering performance, which increases the service life. Includes mounting screw pack These heavy duty caster wheels are ideal for a huge variety of uses DIY to industrial applications workbench, trailer, workshop, shop cabinet, toolbox, scaffold, desk, Shelves, Pallet rack, Portable flatbed, manufacturing stand, rolling box storage, heavy machine shop utility tools. The wheels for cart can be easily installed and used, and are designed for handling. Swivel outdoor caster have a wide range of uses, such as pallet trucks, inventory carts, trolleys, platform carts, shopping carts, furniture, luggage carts, workbenches and many other uses. Caster SIZE: Industrial caster diameter: 4,5,6,8 inches, width: 2 inches, top plate: 4x 4-1/2,with Needle roller bearing, One caster wheel Load capacity is 800-1200lb,one set of 4 load Capacity will be 3200-4800LB