This heavy duty self-leveling castor is unique in its function allowing movement on a swivel castor and positioning on an anti vibration rubber pad by a handwheel adjuster. 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 Plate Fitting with Handwheel in Black