The WS6 security door chain complies with the TS0032012 DHF standard for door chains and limiters, and is Secured by Design approved. This door chain is simple to install and easy to use, holding the door in a slightly open position whilst restraining against a forced attack. Also helps you identify a caller before the door is fully released. This Yale YALVWS6EB can be fiited in less than 2 minutes so you get instant full protection and security. The WS6 is finished in Electro Brass and carries a 2 Year Guarantee.