611-4442 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 Hexagonal Spanner adjustment. With a die cast aluminum body these sturdy multifunctional castors can take a load of 1000kg when stationery on the rubber pad and 500kg when moving on the castor wheel. Attachment to machinery and equipment is by a forged steel top plate. Footmaster Castor 120-132mm 500kg Load Capacity Plate Fitting with Hex Spanner Adjustment