Heavy duty caster wheels: PU polyurethane wheels, 360 rotation, smooth glide without hurting the ground and good grip. Ball Bearing: Integrated ball bearings make the casters slide more smoothly. the maximum capacity of 4 furniture making wheels is up to 530 lbs. SUITABLE FOR HARD FLOORS: Don't worry that our ball casters will damage your hardwood floors without leaving any marks. furniture wheels help protect hard floors. Widely Used: Commonly Used In Industrial And Residential Applications Such As Workbenches, Tool Carts, Tool Chest, Counting Carts, Cabinets, Shelves, Coffee Table And Other Movable Furniture, etc. Size: 2 inch & nbsp; Specifications: Wheel material: Pu Polyurethane Package includes: 4 roulette wheels Product size: - 2 inches Top plate size: 71 52mm Wheel diameter: 50mm Wheel width: 24mm Mounting height: 71mm Installation hole distance: 50 35mm Size calculation method: 1mm = 0.039in Single load capacity: 60kg / 132lbs