Trac-Rite Model 944WL is ideal for the same residential, self-storage, and light-duty uses as our Model 944. In addition, Trac-Rite's windlock system provides maximum wind resistance for the model. As wind blows against the 944WL, the curtain's windlocks engage with the door guide for a strong interlocking grip. The continuous curtain of solid steel is durable and attractive.All models are constructed using high-quality, durable materials for smooth operation and long life. From initial design to the delivered product, Trac-Rite provides a door that is built to last.