It is an “interlocked” security system consisting of a special steel double-claw main lock combined with chrome - plated special steel upper and lower security locks having 3 steel bars each.
The upper lock with specially profiled brass latch operates the steel bar providing extra security in addition to the main lock.
Thanks to the bars of the double-claw steel main lock, it is difficult to disconnect the door panel from the door frame by using a lever or a similar tool.
With a single control, upper and lower security locks having 3 galvanized steel bars each operate together.
Cylinder, ensures 6th (top) grade security according to EU Noröm EN 1303 Standard.