18" x 18" Flush Access Door for Plaster Walls & Ceilings - Acudor Rough Opening Size=18 &frac38;" wide x 18 &frac38;" high";" Material: 14 gauge steel, Finish: 5 stage iron phosphate preparation with prime coat of White alkyd baked-on enamel Lock / latch: 2 x Stainless Steel Screwdriver Operated Cam Latch Hinge: Continuous, Concealed Flange: Expansion casing bead with 3" wide galvanized lath, recessed 3/4" to receive plaster