This 160mm extra heavy duty castors are made of a heavy duty pressed steel zinc plated, housing a 6 polyurethane wheel mounted on a cast iron 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 castor head and the wheel, making these 6 lockable castors easy to use. These castors with brakes are suitable for a range of heavy duty applications. Load capacity 700kgs per castor, combine 4 from this range to carry 2 tonnes castors.