Solid, one piece 4" square box swivel hangers with the ground wire pre-installed for 1/2" or 3/4" pipes are used to hang light fixtures, security cameras, speakers and other electrical/electronic devices from standard 4” square junction boxes. They require no extra mounting boxes and hangers, and allow a 20° swing from vertical. They are great for industrial settings where conduits are bumped or jostled occasionally. The dedicated ground wire connects swivel-ball knuckle and steel cover, so the two permanently bond to achieve proper grounding.