This security door chain is a simple but effective way to help prevent forced entry into your home. It is manufactured from nickel-plated iron / Brass and is ideal for use on entrance doors in houses and flats. The chain features a sliding release mechanism that allows you to open the door to a limited extent while still maintaining a level of security. The chain has an approximate size of 110mm, making it suitable for a wide range of doors. Fixing screws are supplied for easy installation. Whether you're looking to increase the security of your home or just want a bit of extra peace of mind, this door chain is a great choice.