Casters Heavy Duty: The load capacity is strong, each 4 inch caster can carry 250 pounds, 4 castors can carry 750 pounds to 1000 pounds, using double bearings, polyurethane, silent, no trace, protect the groundDouble Bearing Casters: Each caster has two bearings, the quality of the bearings is very good, wear-resistant and durable, strong load capacityNo Noise Caster Wheels: 4 inch casters, very quiet when walking, especially suitable for indoor use, does not hurt the ground, flexible movement, leaving no marks on the groundCasters Set of 4: Due to the convenience of customers, we have 4 casters in a set, which are delivered with iron gaskets and screws. Each caster has a load of 250 pounds, and the quality is stable.Typical Applications: Casters are widely used in benches, trolleys, furniture, Carts, Dolly, Workbench, Trolley, suitable for indoor and outdoor, it is a mobile expert