ASTA Door 400 Series Heavy Duty Rolling Steel Service Door is produced with the highest quality and durability in the industry. The 400 Series consists of 3 - 24, 22, 20, or 18 gauge slats with a flat or curved slat profile. The 400 Series has three finish options - White Topcoat, Prime Gray, or Galvanized. The 400 Series is available in sizes up to 40 wide or 30 high (varies by model). Standard features include enclosed hood, reduction gear chain hoist, 3 piece structural steel guides, and a double angle bottom bar with weatherseal. The 400 Series is the perfect choice for industrial, commercial, or high cycle applications.