Modern door chain locks include safety and security in a similar way to a screw. They allow a door to be opened up to roughly 150 mm and also still keep it safely fastened. The passenger can examine a caller's identification prior to fully opening the door.
A 'door guard' provides very good safety and also is more robust than numerous door chains. The sphere handle gets in the void in between the metal bars in the closed-door placement yet the gap in the slide bar is not wide enough to release it when the door is open.
The 'Security-chain' is concealed in the door frame and has a push button procedure for fast, simple locking. Like other chains and guards , it can just be unlocked when the door is closed.
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