Where to sell the anti theft door fence type, it is the old one. I want a cheap one

Go to a specialty store, or to the local building materials market. Navigate with a map. Don't be cheap. There is a steel stamp on the inner frame of the anti-theft door "A, B, C, D", which is relatively stable, and the one without the steel seal is definitely not an anti-theft door, which can only be called a steel door.

It's usually in places like local decoration material cities. In fact, the thickness of the iron plate of the anti-theft door, a few lock points or anything is not important, because the thief will not destroy your anti-theft door to enter, not to mention the effort is easy to be found, and now the market is openly taught to open the lock, sell the master key, in the sturdy and complex lock is useless, my sister's house was stolen two days ago, thousands of dollars to buy the anti-theft door on the trace of prying, and finally found out that the thief is using the master key. Installing a building door and a sturdy burglar-proof window is the way to go.

There are cat's eyes everywhere the door is sold, and some property management also sells them, which is very cheap, dozens of yuan.

You can contact the manufacturer, and the general manufacturer has a door to deal with (quality defects, trial products, termination of the contract and other factors).

It is recommended that you buy it on Taobao, which is much cheaper than in a physical store. Just pay attention to the specifications of your existing lock when buying, otherwise you can't use it. I've bought good ones online.