100mm Machine Solid Nylon Wheel equipped into an extra sturdy Fabricated Major Plate Swivel Castor having a double thrust bearing while in the swivel head to optimise the load ability. The correcting bolt spacings are the European Regular dimensions of 80x60mm. The load potential of the castor is 900kg at https://castors22086.theblogfairy.com/14551962/castors-options