These 125mm extra heavy duty castors load capacity 300kgs each, overall height 164mm, 4 x M10 Bolt Fixing Plate, these 5 braked castors are made of a heavy duty pressed steel zinc plated, housing a solid rubber wheel mounted on an aluminum centre. This castor wheel runs on ball journal bearings, making the heavier loads easier to move. The foot operated wheel brake simultaneously brakes both the swivel caster head and the wheel. These heavy duty braked casters are suitable for a range of heavy industrial applications.