Acorn Access Doors are Ideally Suited for New Installations or for Remodeling, in Masonry, Tile, Wood or Other Wall and Ceiling Surfaces. Doors Feature Rounded Safety Corners. Doors and Frames are Fabricated from Galvanized Steel with a Prime Coat Finish. The Frame is One Piece Construction, 1'' Wide and Provides Perfect Concealment of the Rough Wall Opening. The Wall Frame is Provided with 1/4'' Mounting Holes for Fastening within the Furred Spaces Allowing Faster Installation and Fixing the Maximum Clearance. Concealed Pivoting Rod Hinge Prevents Distortion and Closes Door Squarely. Doors 24'' or Larger are Provided with a Continuous Piano Hinge. Latch is Screwdriver Operated