4 x 4" Heavy Duty PU Swivel Castor Wheels With BrakeThese 4 x 4 heavy duty polyurethane double bearing brake swivel castor wheels from Randy & Travis Machinery are just what you need for your trolleys and workbenches. With a 550 kilogramme brake load, these 100 millimetre professional grade wheels are just what you need for your trolleys and workbenches. These wheels won't mark your floors, thanks to the polyurethane wheels. Duplex bearing construction makes rolling effortless. Two wheels have foot