Air Grille Vent Register - Four Way Lanced - Steel - Heavy Duty - 12 x 12" (measures approx.  13 3/4 x 13 3/4" on the front & 11 5/8" x 11 5/8" on the back opening). For use on walls and ceilings.  High quality, includes open/close lever and 2 - 2" mounting screws. Made by Venti Air Products Corp. Please note: Black marker writing info is on the plastic cover, not on the vent.