This medium 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 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 a forged steel top plate. Footmaster Leveling Caster 102-117mm 250kg Load Black