I heard that the security door is the most difficult to do, is it difficult to cut the corners, and

Cosmic Golden Gate is to make security doors. Fire doors. Double open. Mother and son door.

The anti-theft door at home is opened, it is difficult to open when unlocking, the reason is that the lock cylinder is aging and the inside is not flexible enough, it is difficult to insert the key, it may also be caused by the deformation of the lock cylinder mechanism, and the aging of the lock body mechanism leads to the unlocking of the lock and the deformation of the unlocking mechanism, if there is a heaven and earth hook after unlocking, it is difficult to open the door is likely to be caused by the deformation of the anti-theft door anti-theft mechanism or a part falling down, which is very simple, find a locksmith to take a look, and then not directly change the lock body lock cylinder, 200 yuan to get it, It's best to find a professional for installation.

The security door is made of steel, and the fire door is generally made of wood.

It's hard to do a security door business right now.

The most important thing to do security door business is to choose a good brand of security door, to do security door is either to fight the price, or to sell the brand, in or there is a selling point. >>>More

There are many types of security doors, and whether the Taotao security door is a grade A security door you should go to see their qualifications.