Convenient, without a key. Universal additional security for convenient locking without a key. Do you want to reliably secure your aluminium, timber or PVC-U windows and also value simple installation and convenient operation? This additional lock is the solution. The security device is fitted to the window frame without drilling into the window sash. It can be opened and closed without a key. The solid steel bolt engages automatically. The bracket is folded down manually to secure windows and French doors and then folded back again to open them.