This 80mm braked polyurethane casters is made of a zinc plated housing which ensures the castor is robust enough and suitable for a variety of environments. The swivel braked castor , with the polyurethane wheel is strong and durable and suitable for moving machinery and equipment. The polyurethane tire is bonded onto the polyamide nylon centre making the castor strong and durable. The foot operated wheel brake simultaneously brakes both the swivel castor head and the wheel.**** PLEASE NOTE TREAD WIDTH IS 30mm (NOT 38mm AS STATED WITHIN THE 2D DRAWING) ****