611-4492 RS compatible Medium Duty Leveling Footmaster Castors are unique in their function allowing movement on a swivel castor and positioning on an anti vibration rubber pad by an integral Ratchet adjustment. With a die cast aluminum body these sturdy multifunctional castors can take a load of 250kg when stationery on the rubber pad and 125kg when moving on the castor wheel. Attachment to machinery and equipment is by an M12 threaded stem. Footmaster Castor 82 - 92mm Ratchet 125kg Dynamic Load Capacity Stem Fitting