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1. You should choose products from companies with high popularity, stable quality, and good after-sales service.
2. First check whether the logos and signs of the purchased product packaging are complete (including product implementation standards, grades, manufacturer name, address, and production date) whether the packaging is firm, and whether the contents of the manual are consistent with the product, and beware of exaggeration that does not match the facts Phenomenon.
3. Observe the appearance and quality of the product, including whether the lock head, lock body, lock tongue, handle and cladding parts and related accessories are complete, whether the surface color of the electroplated parts and painted parts is bright and uniform, and whether there are signs of rust, oxidation and damage .
4. To check whether the function of the product 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 inner and outer locks respectively. You should also check the insurance mechanism of the product. It is recommended to try each lock at least three times.
5. Then check the teeth of the key. For example, if there are five teeth, each 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 conducive to the insertion of the key. Pull out and not easy to break.