Milliken Millwork Majestic Steel Front Door unit comes with our MSystem 2-warranty on both the Door Component and the Base Prehung System, as well as a 10-year warranty on the Glass Lite. All of our Majestic Steel doors are galvanized to resist rust and corrosion, are comprised of 24-Gauge, high quality steel with 22-Gauge steel stiles and rails for additional strength and security and come with a one-piece, high density polystyrene core delivering excellent insulation allowing it to meet or exceed current energy code standards. Door size is 36"x80". Unit dimension is 37.5"x81.75". The suggested rough opening is 38"x82.25". This unit comes with a 4-9/16" wide primed finger jointed frame.