STURDY HEAVY DUTY CASTER: SAVING STRENGTH] These casters set of 4 heavy duty are with rock-solid construction, which is made from premium thickened steel housing, thickened top plate and each plate caster has double support bearings. Strong loading capacity is up to 2200lbs as a set of 4 caster wheels heavy duty, each wheel can carry 550lbs, SAVE YOUR BACK AND EFFORT. | DOUBLE SAFETY BRAKE: The 4 inch caster wheels are 360-degree rotating, also each swivel caster has a separate brake which locks both the wheel and the swivel simultaneously. When brake is pressed down, holding the equipment firmly in place, effective to stop and prevent the devices from moving and hurting others. | Smooth & Non-marking: Casters are made of superior polyurethane material, wear-proof, gliding silent to ensure quiet operation and protect floors from scratches. Add a dust-proof ring to protect ball bearings. | Easy Installation with Complete Fittings: Each package included whole hardware kits of wrench, screwdriver, 16 screws and washers,16 bolts and nuts to meet customers’ different installation of castors | Wide Application: Caster wheels heavy duty are suitable for indoor and outdoor, widely used in benches, trolleys, furniture, Carts, Dolly, Workbench, Trolley. Reliable assurance with 30-day return policy for any non-damage issues