For use in insulated ceilings. Air-Tite exclusive housing gasket. Air-Tite tested per ASTM E 283. All-Nail bar hangers with preinstalled nail and integral T-grid clip. q-channel interlocking hanger bars. Hanger bars feature Pass-N-Thru tool-less shortening. Quick connect push-in wire nuts included. Hinged junction box with Slide-N-Side. No socket bracket speeds install, for use with socket supporting trims