Fire Rated Access Door, Flush Mount, Insulated, Material 20 ga Galvanized Steel Door; 16 ga Cold Rolled Steel Frame, Access Door Installation Wall or Ceiling, Door Height 18 in, Door Width 18 in, Rough Opening Height 18 1/4 in, Rough Opening Width 18 3/8 in, Closure Type Self-Latching Tool Key and Ring Operated Slam Latch, Hinge Type Piano, Mounting Hole Size 8 Holes Diameter 1/4 in, Finish White Powder Coated Primer WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)