Chain Operated roller shutters are used when there is no electricity on site. This is ideal for remote locations or agricultural applications. It is one of the most versatile and economical roller shutters available and can be up to 5m wide and 5m high. The 75mm curved steel bars are available in 22G (0.7mm) and 20G (0.9mm), depending on the size of the roller shutter door and the level of security required. Industrial steel roller shutters are also available with a pass through, allowing pedestrian access without having to open the shutters completely.