This Plate Rigid PP Industrial Caster The PP material is low rolling resistance, absorbs noise and protects floor, resists water and chemical absorption. This rugged cold forged fork is very strong and recommended only for manually moved applications. The maintenance of castors is usually: Regreasing the axle and swivel bearings and removing any debris from these areas. Size Wheel Diameter Width of Casters(mm) Height of Installation(mm) Top Plate Outer Size Load Capacity(kg) Wheel Material 3inches 75 22 …