How to buy anti-theft door locks

First, look at the overall appearance:
1. There are enterprise trademarks, corporate logos and enterprise product liability insurance insurance marks on the outside of the products;
2, remove the outer packaging, the product should also be covered with a layer of plastic film to ensure that the product is moisture-proof and dust-proof during transportation and storage;
3, remove the film, the appearance of the product should be no obvious flaws, the board surface has no obvious undulations, no bumps, scratches, paint stripping, desoldering, product accessories are available;
4, the doorbell is crisp and sweet, no long and no sound;
5, the cat's eye has a broad view, high definition, no damage to the glass lens;
Second, check the supporting services:
1. You should get an insurance policy when you purchase the security door. You should complete the receipt and return the receipt. Send the insurance policy to the insurance company within one week (the address is indicated on the insurance policy) as the basis for the approved insurance, please be sure to ask for the insurance policy and read it carefully and keep it properly;
2. At the same time, you should also get a warranty card, please specify the date of purchase, the point of sale and the contact number, in order to contact them when needed, and also as the basis for the approved warranty period, please be sure to ask for the warranty card, and properly save;
3. A good security door should be a reliable product. Therefore, there is a certain warranty period. During this period, the warranty should be free of charge. The replacement parts only charge the cost of the parts and can provide the charging standard. If the warranty period is exceeded, the working hours can be charged, but the fee should also be charged. standard;
4, a good security door sales office should be able to guarantee 24 hours of after-sales service, and make a public commitment to the user, when you need help, in response to the shortest possible time;
5. As one of the supporting services, the security door sales office should ship the product to the installation location free of charge and install it free of charge (if it is too far apart, it can be charged at the discretion);
Third, than the product quality:
1. A good product should be a qualified product. A good security door should comply with the national technical standard for anti-theft security doors (GB17565-1998), and indicate the product implementation standards outside the product;
2, good security door security is equipped with a good anti-theft lock, these anti-theft locks should comply with the national standard for anti-theft mechanical locks (GA/T73-94), the lock should be engraved with "AFS", "SHIHI" and other professional lock manufacturers symbols of;
3. A good security door should have a strong inner lining and internal filling material. It is a relatively simple criterion to judge the dull "beep" sound by tapping the door leaf by hand;
4. The plate of the good security door is pressed and formed by the hydraulic press at one time. Therefore, the plate surface has a strong three-dimensional effect and smooth lines.

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