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. The 24 gauge model is our standard weight door and is an excellent value, suitable for almost all installations. It is available in two colors, white or a very distinctive dark bronze. The 20 gauge door, available in white only, has a 33% thicker steel skin which is stronger and more impact resistant. 20 gauge is recommended for larger doors, or where heavy use is expected.