Whether the locks of doors and windows are firm and durable often plays an important role in home safety. Therefore, consumers naturally need to keep an eye out for inferior products during the purchasing process. Here are a few purchasing suggestions for everyone:

1. It is recommended to choose enterprise products with high popularity, stable quality, and good after-sales service, which can save consumers a lot of worries;

2. Check if the labeling and markings on the packaging of the purchased product are complete (including the product's execution standards, grade, production company name, address, production date), whether the packaging is firm, whether the content of the manual matches the product, and be cautious of exaggeration and inconsistency with the facts;

3. Observe the appearance quality of the product, including whether the lock head, lock body, lock tongue, handle and cover components and related supporting parts are complete, whether the surface color of electroplated and painted parts is bright and uniform, and whether there are signs of rust, oxidation, and other damages;

4. Check whether the product's usage function is reliable and flexible. Two or more products should be selected for comparative inspection. Especially when purchasing two-way lock products, all keys must be used to test the opening and closing of the inner and outer locks separately. It is also necessary to check the insurance mechanism of the product, and it is recommended to try each lock at least three times.

5. Check the condition of the key teeth, for example, if there are five teeth, each type of key should have no less than three different teeth. At the same time, try not to choose the deepest teeth for the first and fifth teeth, which is also conducive to the insertion and extraction of the key and is not easy to break.