1 Look at the surface treatment
Lock factory generally after plating, spraying or coloring, these steps for the lock itself is beneficial, because after this series of treatment, will form a protective film on the surface of the lock, can play a role in corrosion and oxidation. Users can directly measure the good and bad locks through this point.
2 weigh than feel
Jerry-built locks are generally made of hollow low-quality materials, not only weighing light, but also use the feel is also poor.
3 Look ~ standard
Domestic and foreign for hardware locks have very strict standards, small manufacturers will be in order to save costs not according to the standard implementation, and well-known brands will generally comply with the standards.
