Low-maintenance, economical, impactable loading dock door. With no plungers, rollers, cables, or exposed torsion springs, it is a low maintenance and decreases down time. Galvanized guides and heavy-duty rubber curtain provide durability, security, and ease of use for the loading dock. Designed to work with either manual or motorized operation. It has a low-headroom design making it easy to fit in areas where space is minimal and access is difficult.