Used to hang light fixtures between joists or structural members with ENT wiring system. Includes 4 inch round ENT box. Not designed for ceiling fan support. RACO nonmetallic cable boxes provide the installer with a cost alternative that is lightweight and easy to install. TKO knockouts offer greater flexibility with RACOs patented combination 1/2 and 3/4 inch knockout. 1/2 inch setback with ceiling surface. Bar hanger adjustable 14-1/4 inch to 22-1/2 inch.