R-W R400 SERIES INSULATED ROLLING SERVICE DOOR is produced with the highest quality and durability in the industry. The 600 Series comes in 24, 22, 20, or 18-gauge slats with a flat profile and 24 or 22-gauge back slat that encloses a 5/8” thick insulation strip between the two slats. The 600 Series is available in sizes 40’ x 16’ to 28’ x 26’ (varies by model). The 600 Series is the perfect choice for industrial, commercial, or climate-controlled applications.