Security Chain Door Lock - Chrome plated zinc alloy material with 180mm PVC covered chain. Helps identify caller before door is fully released. Supplied with fitting screws. This essential security device provides an additional layer of protection by allowing you to verify a visitor's identity whilst maintaining control of your entrance. The durable zinc alloy construction resists corrosion, ensuring long-term reliability in various weather conditions. The PVC-covered chain prevents damage to door frames and reduces noise during operation. Installation is straightforward with all necessary fixings included, making it an ideal upgrade for residential and commercial properties seeking enhanced entry security without compromising convenience.