80mm Grey Rubber Tyre wheel on a plastic centre wi... Read Moreth a roller bearing fitted into a pressed steel swivel castor bracket. The Swivel Bracket has a 4 hole top plate with 80x60mm bolt hole spacing. The load capacity of this castor is 70kg using manual propulsion at 4km/h (walking speed)The Grey Rubber Tyre is a softer wheel compared to hard tread wheels like nylon and the rubber absorbs vibrations whilst in motion making this a low noise option and will not mark or scratch the floor. The roller bearing lowers the rolling resistance to reduce the effort required to move the castors. Together with the strong bracket that has a double ball race in the swivel head makes this castor a great choice for many industrial or domestic applications.