How to install a zipper lock on the security door

It's anti-leeching.

Most of the anti-theft doors are metal, and the anti-theft chain itself comes with a self-tapping wire that is generally installed on the wooden door. You go to the hardware store and buy a few "dovetail nails" that specialize in tapping iron (if possible, drill a hole in the door with a drill that is one size thinner than the nail, and the nail can be easily screwed on.) Without an electric drill, the hand screwing knife is twisted by hand, but it will take a little more effort) The tip in front of this nail can easily penetrate the iron sheet of the anti-theft door, and the tail of the nail is a thin wire buckle, which can firmly lock the anti-theft chain.

Most of the anti-theft doors are metal, and the anti-theft chain itself comes with a self-tapping wire that is generally installed on the wooden door. You go to the hardware store and buy a few "dovetail nails" that specialize in tapping iron (if possible, drill a hole in the door with a drill that is one size thinner than the nail, and the nail can be easily screwed on.) Without an electric drill, the hand screwing knife is twisted by hand, but it will take a little more effort) The tip in front of this nail can easily penetrate the iron sheet of the anti-theft door, and the tail of the nail is a thin wire buckle, which can firmly lock the anti-theft chain.