Industrial & Commercial Steel Garage Doors by General Doors Corporation are designed, engineered and manufactured specifically for the rigors of everyday use. All of our doors are built tough with the proven strength of deep ribbed, box girder construction eliminating sag, resisting wind load and reducing impact damage. A strong continuous exterior of galvanized steel provides optimum security, while the double coated, baked enamel finish promises years of low maintenance, good looks and worry-free durability.