【Heavy-Duty】: NINOSO Casters wheel are made of High-quality Polyurethane(Polyolefin Core) and bright galvanized steel plate. The Heavy Duty Caster Wheel have strong abrasion resistance, and have strong shock absorption and buffering performance, which increases the service life. INDUSTRIAL CASTER SIZE: Caster size diameter: 8 inch, width: 2 inch, Hub Length: 2-7/16 inch,with ¾" roller bearing. Top plate: 4x 4-1/2 inch, total height: 9-1/2 inch. Polyurethane wheels have excellent floor protection and easy rolling properties. 【High Resistance】The newly upgraded wheels for high-grade material polyurethane, The heavy duty casters wheels can withstand most chemicals, solvents, acids and oils, without fear of any environment, giving you a perfect. 【Widely Use】: Caster have a wide range of uses, such as pallet trucks, inventory carts, trolleys, Toolbox, Workbench, Industrial Equipment and many other uses. store fixtures, and more. Also High-quality Caster wheel can drastically help you improve your Heavy Duty Caster rolling performance in the right environments. Rolling Smooth & Silent: Swivel casters are very quiet and smooth while rolling, safe for all types of floor including wood floor. NINOSO 8" Heavy Duty Casters, Plate Industrial Casters Set of 4 with Load 4400lbs Capacity, Polyurethane Tread on Polypropylene Core, Swivel Caster Wheels (2 Swivel & 2 Rigid)