611-4436 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 allowing a height adjustment from 102mm to 117mm. 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 a forged steel top plate. Easily adjustable using integral ratchet system, one fitted no need for additional tools, just extend the ratchet and move up or down.