Garvin Industries 4" Square Swivel Fixture Hangers are used to support light fixtures, security cameras, exit signs, and a variety of electrical and electronic devices installed in industrial settings.  Swivel Fixture Hangers have a rugged steel construction and cast iron pivot ball that allows the installed fixture and pipe stem to swing 20 degrees from vertical when  subjected to occasional bumps or vibratory jostling.  Swivel Fixture Hangers come in both "solid" one piece construction or "Hands Free" hinged door versions.  The hinged door version allows the installer to wire the fixture after it has been installed on a 4" Square box.  These covers accommodate 1/2" & 3/4" threaded conduit or connectors.