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 ...

Material and workmanship, locks prices ranging from ten dollars to several hundred dollars, A grade, B grade, ultra-Class B market locks lock cylinder is divided into several. Consumers to identify the lock cylinder can through the billiard row number how many good or bad. In general, multi-...