Pressed steel swivel castor, medium heavy duty brackets, with top plate fitting, Heavy duty wheel with Blickle Extrathane® polyurethane tread, with aluminium wheel centreBracket: Made of pressed steel, with double ball bearing in the swivel head, ball protection by the special top plate and ball disc design. The special Blickle dynamic riveting process of the swivel head results in minimal swivel head play and smooth rolling characteristics with an increased service life achieved by the work hardening of the ball race grooves. Bolted wheel axle. Zinc-plated, blue-passivated, Cr6-free.Wheels: Tyre & running tread: Made of high-quality polyurethane-elastomer Blickle Extrathane®. Color: light brown, Shore: 92° Shore AHigh chemical resistance to many aggressive substances. Operating temperature: -25° C to +70° C, temporarily up to +90° C. At ambient temperatures above +40° C the load capacity is reduced. The indicated load capacity refers to applications without obstacles. Maintenance-free under standard conditions.