Heavy Duty Casters: ASOMWLS Casters are composed of non-marking polyurethane tread and then cast upon an cast iron core. Offers higher weight capacities while providing good floor protection and a smooth quiet rolling operation. Industrial Caster Size: The diameter of industrial caster is 4", the width is 2", HUB Length is 2-7/16", the top plate is 4 x 4-1/2", the total height is 5-5/8". Equipped with a ¾" roller bearing and a ½" inner diameter wrench bushing. Each caster can bear a maximum weight of 800lbs, set of 4 casters load 3200lbs. Smooth & Silent Operation: Minimize friction and reduce noise with industrial caster wheels with roller bearings. They also generate less friction heat and may prolong the life of the wheel. The shock-absorbing design ensures a quiet and efficient work environment, allowing you to limit distractions. Galvanized York & Greasing Fitting: The caster yoke surface has a galvanized anti-rust coating. The grease fitting design simplifies the maintenance process, reduces maintenance time, and enables users to quickly lubricate the rotating parts of the casters, extending their service life. Widely Used: Heavy duty casters works well in both indoor and outdoor use in industrial, warehouse, and manufacturing environments. Used in tool box, workshop table, steel table, dolly, workbox, dumpster, trolley, institutional equipment and carts. ASOMWLS 4'' x 2'' Caster Wheel Heavy Duty Industrial Caster, Polyurethane on Silver Cast Iron Core Wheels for Cart Platform Truck Workbenches, Each Casters Load 800lbs (1 Rigid)