The Model 600 Rolling Grille offers security, visibility, and ventilation in several patterns and finishes. Rolling Grills provide security against entry or theft with slide bolts or padlockable chains while the design allows visual access through the door opening space. This rolling grille also offers an emergency egress option as an additional security feature. Model 600 is constructed with vertical aluminum links and horizontal steel rods with spacer tubes and end links that ensure that the grille cannot be pulled from guides. The counterbalance assembly consists of a spring barrel which serves as a load-carrying beam. It encases the counterbalance mechanism and provides the axis around which the curtain coils.