Milliken Millwork Fiberglass Front Doors are built to last and can add substantial curb appeal to your home. This fiberglass oak front door unit comes with our MSystem 2 Warranty on the Door Component and the Base Prehung System as well as a 10-year warranty on the Glass Lite. All of our fiberglass oak front doors are virtually maintenance free and will not warp, rot, dent or split. Our prehung door unit (called the MSystem) seals out the weather and practically eliminates air and water infiltration all together. 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 oak grained composite frame.