12 x 12 FD - Fire-Rated Insulated, Flush Access Panels for Ceilings by JL Industries Rough Opening Size=12 &frac38;" wide by 12 &frac38;" tall";" Material: 16 gauge steel frame, 2" thick 20 gauge steel insulated door, Finish: White powder coat primer Lock / latch: Universal turn ring and key lock Hinge: Continuous hinge Flange: 1" flange