Two of these rods are required to make up the sizes stated above and are fitted to further extend the espag. rod length. Excaliburs centre claws lock securely into a very substantial centre keep, whilst two steel shootbolts lock into the corners of the window for incredible resistance against attack. With salt spray corrosion resistance in excess of 500 hrs, Excalibur offers endurance in addition to security. Conforms to BS7950, Secured By Design and BBA approvals. Sold in singles with two rods needed to complete the system.