This 160mm extra heavy duty castor is made of a heavy duty pressed steel zinc plated, housing a nylon wheel. 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 castor head and the wheel. These castors are suitable for a range of heavy duty applications. Heavy Duty Swivel Castor with Brake 160mm Nylon Wheel