This medium duty leveling Footmaster castor is unique in its 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 500kg when stationery on the rubber pad and 250kg when moving on the castor wheel. Attachment to machinery and equipment is by an M12 thread. Footmaster Leveling Casters 102-117mm 250kg Load Capacity with Stem Fitting in Black