Different from commercial hardware standards, civil hardware accessories have been used for a long time and are prone to many problems here and there. Especially the door lock, which is a part of high load operation, has a long service life, and it is inevitable that there will be a little failure. It is often found that some users and friends, the damage of the door lock in their home is often caused by improper use or maintenance.

The surface of the zinc alloy handle lock will have a copper plated design, which is similar to the copper die cast handle lock. You can use a file to rub the bottom plate of the cable giant to see the traces left by the file. If it is brass, it indicates the copper die cast style of the handle lock. Silver white is the material of zinc alloy.