F-Series Triple Gang Cover Plates are non-metallic and designed to work with F-Series boxes and come in a variety of configurations from blank covers to duplex and toggle style covers. Utilities cable communications residential airports subways bridges & tunnels mines marinas water/sewage treatment plants pulp & paper industries street & highway lighting food processing plants agricultural parking garages car washes fish plants steel mills Durable PVC for long life Suitable for indoor applications Comes with brass screws