Pressed steel swivel castor, medium heavy duty brackets, with top plate fitting, Cast iron wheelBracket: Made of heavy pressed steel, swivel bracket with double ball bearing in the swivel head, swivel head seals. 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 grey, cast iron. Color: silver grey, Shore: 180 - 220 HBOil-resistant. Operating temperature: -100° C to +600° C. A temperature-specific grease must be regularly applied. The relatively high floor pressure should be considered for pressure-sensitive floors.