We incorporate a multi-point locking system into each of our bi-folding doors. The ultra-secure lock engages at several different points, and in several different directions, into a very tough lock keep. When it does so, it keeps the door sash firmly fixed to the door frame.
The double or triple glazed units are ridiculously hard to break, each door is designed to be as secure as possible to keep your home safe. Cylinder locks are within the high security master handles too as a further deterrent to thieves.