Swivel castor with a fabricated steel castor bracket, fitted with a cast iron ball bearing centre wheel. These swivel casters range from 100mm - 200mm and have a capacity up to 500Kg per caster.The load carrying capability of t cast iron material is much higher than normal similar wheels materials . They have a hard tread useful for heavy applications where the equipment is often subject to a hard working environment. They offer a low rolling resistance when compared to traditional hard tyred castors.Very important to remember this is a premium cast iron steel not to be confused with other lower grade alternatives which make claim to similar loads and rolling resistances which are incorrect. Idea for waste bins, steel stockholders trolleys or where abuse is likely.