Slim Profile 1 Inch Rectangle Canopy and Junction Box (included with 1R selected in fixture ordering code). The Slim Profile with hanger bars mounts to studs spaced between 14.5 to 25 inches apart behind drywall. Allows low voltage DC wires from remote power supply to connect to channel wires. The junction box opening is covered by the fixture for a clean, safe connection. Includes a goof plate, for poor plastering around j-box, which may be plastered and painted.