The 593 Series is the best-selling door in the Thermacore line, and offers superior thermal efficiency to fit a broad range of applications. The 593 Series exterior skin is constructed of galvanized steel with a ribbed, textured finish. It is available with a white interior finish and either a white or Industrial Brown exterior. The Thermacore 593 and offers excellent thermal efficiency for medium-duty applications. This product is exceptionally popular choice for applications such as an RV-door.