Common knowledge of door lock
![door safety lock](https://www.lockcomponent.com/wp-content/uploads/2022/11/5d60860042bc5.jpg)
A door lock is very common in our daily life. You can see it when you go to a room. The lock which is hidden inside of a door is much more complicated than you might imagine. Common knowledge of door lock There are three main kinds of door locks on the market, though there are slight […]