PACKAGE: Included 4 Casters, 4 Bolts, 4 Washers and 1 Spanner. BIG TIRE: 4'' Diameter and 32mm Thickened Wheel LOAD CAPACITY: Total 2200 lbs (550 lbs each caster) MATERIALS: Premium Polyurethane + Heavy Duty Thickened Steel. Make the wheels Antiwear, Shock-absorbent and Silence. UNIVERSAL: Perfect casters replacement for your utility carts, furniture, home appliances. Also It can make your workbench, trolley, shelf, freezer, grill, fire pit, cooler, washer, dryer,grinder/ drill press stand,compressor or any other gadget you need move easily and roll smoothly. Save your labor and time. 4" Caster- 3/8"-16x1" with brake