First to recognize the products has name and address, trademark and whether professional quality inspection agency recently issued inspection reports.

Second, locks appearance should be clear, the surface is not rough feeling to be comfortable. The locks open rotating flexible locking device should work, and can not feel the feeling of failure, confidential better performance. Name and address, trademarks and professional quality inspection agency, buy material to moderate feel to firmly reliable, was not to manufacture a selection of cheap quality times with inferior materials, must first understand the product whether recent issued by the inspection report. Second, locks appearance should be clear, the surface is not rough feeling to be comfortable. The locks open rotating flexible locking device should work, and can not feel the feeling of failure, confidential better performance.

Third, Buy material to moderate feel to be a solid, reliable, refrain from selection of cheap and poor quality inferior materials manufacturing all kinds of locks.

Fourth, Locks installation is key: Installation must be strictly in accordance with the product instructions need to clearly understand the installation center distance, the scope and locks open. Particular attention in order to prevent the corrosion of the harmful substances can not be installed in the high humidity of the wood frame door on.

Fifth, I usually keep the lock body clean to prevent foreign matter into the lock cylinder marbles tank, resulting in open fight rolling, even the lock can not be opened.