Check whether the function of the product is reliable and flexible. You should choose two or more products for comparison and inspection. Especially when purchasing two-way lock products, you must use all keys to test the opening and closing of the inner and outer locks respectively. You should also check the safety mechanism of the product. It is recommended to try each lock at least three times.
 
1. You should choose products from companies with high reputation, stable quality and good after-sales service.
 
2. First check whether the labels and marks on the packaging of the purchased product are complete (including product execution standards, grades, production company names, addresses, production dates) whether the packaging is firm and whether the content of the instructions is consistent with the product. Be careful not to exaggerate and be inconsistent with the product. Factual discrepancies.
 
3. Observe the appearance and quality of the product, including whether the lock head, lock body, lock tongue, handle, cover plate parts and related accessories are complete, whether the surface color of electroplated parts and spray-painted parts is bright and uniform, and whether there are any signs of rust or oxidation. and damage.
 
4. Check whether the function of the product is reliable and flexible. You should choose two or more products for comparison and inspection. Especially when purchasing two-way lock products, you must use all keys to test the opening and closing of the inner and outer locks respectively. You should also check the safety mechanism of the product. It is recommended to try each lock at least three times.
 
5. Then check the tooth pattern of the key. For example, if there are five key teeth, each key should have no less than three different key teeth. At the same time, the first tooth and the fifth tooth should try not to choose the deepest key tooth, which is beneficial to the key. Easy to plug in and out and not easy to break.