Safety door locks on behalf of safe use, so its importance can be imagined, businesses in the purchase of a suitable lock after its safety performance is a matter of first priority, followed by quality question, a good door lock can give you some sense of security!

So when the door is installed must pay attention to check the quality, so as to ensure the safe use of the future.

Quality testing door locks installed to note the following issues:
1, firmly installed in the correct position, the surface clean, no stains, scratches.
2, well after the lock should be flexible, convenient, no cards, no resistance, etc.
3, with a key to open the test should be carried out not shake, no resistance.
4. After the door closed, gently swaying to not shake prevail.