100mm Polyurethane tyre Wheel with an aluminium centre is fitted into an additional strong Fabricated Top Plate Fixed Castor with 80x60mm bolt gap centres. The load potential of the castor is 600kg at 4km/hThis superior general performance castor is equipped with an excellent Polyurethane tyre Wheel having an aluminium centre http://wheels-and-castors54196.topbloghub.com/15323155/heavy-duty-castors-secrets