1. Judging according to the material of the iron padlock body: This involves a lot of professional knowledge and the technology of various manufacturers. The mainland products are generally iron, steel, stainless steel, and zinc alloy. Due to the limitation of technology and cost, the hardness of the lock rod is not enough. It is often easy to be cut by force pliers and hydraulic pliers.
    2. Judge according to the core of the lock: most people buy a lock only by looking at the shape, and think that the larger one must be good. All you have to pay attention to is that no matter which kind of domestic lock you buy, the lock cylinder is generally made of copper, and the characteristics of copper are soft. You can easily damage the copper lock cylinder with an electric drill or concentrated sulfuric acid. At present, the more commonly used lock cylinders are European-style lock cylinders. In addition, there are American threaded lock cylinders and fire-resistant lock cylinders. The latter two are more secure.
    3. Judging according to the key of the lock: There are many keys of the lock, cross, round, crescent, and a lot of different types. Many of the keys are made of copper or aluminum-iron alloy, which is easy to be copied. It is better at present The materials are steel, and there are new types of electronic keys, which are more secure.
    4. Judging according to the thickness of the filler and the steel plate: you can take a look when you install the anti-theft door. Generally, you can see what is inside by unscrewing the cat's eye from the door. If some of the cat's eyes have been installed and screwed If you can't get down, you can watch it when the door is locked. Consumers can knock on the anti-theft door with their hands, and the sound sounds solid, indicating that the thickness of the steel plate is sufficient and the filling is solid. If the sound sounds "poof", it means that the thickness of the steel plate is not enough.
    5. Many lock points are just a cover: locks are an important part of anti-theft doors. When selling anti-theft doors, many people who sell security doors say that they have many lock points. In fact, this is just a cover for soliciting customers. A really good lock is not that the more lock points the better, there is actually no essential difference between 4 lock points and 10 or 20 lock points. No matter how many lock points there are, the center is on the lock cylinder. As long as the lock cylinder is broken, no amount of lock points will be useful.
    6. long shackle padlock chooses to look at the production and sales license: Consumers can check the relevant certification of the product. In addition to this production license, the manufacturer should also have a corresponding technical inspection certificate. Such as fire protection inspection report, airtightness inspection report, etc., so that you can have a general understanding of the technical performance of the product.