611-4470 RS compatible Heavy Duty Leveling Footmaster Castors are unique in their function allowing movement on a swivel castor and positioning on an anti vibration rubber pad by a Handwheel adjustment. With a die cast aluminum body these sturdy multifunctional castors can take a load of 750kg when stationery on the rubber pad and 375kg when moving on the castor wheel. Attachment to machinery and equipment is by a forged steel top plate. Footmaster Castors 120-132mm 375kg Load Capacity Plate Fitting with Handwheel Adjustment