Is there an open security door?

Yes, there are generally security doors that are open inside and outside.

Four kinds of problems: 1: friction between the door frame and the door leaf 2:

Friction between the lower door frame and the lower door leaf 3: friction between the door frame on both sides and the door leaf on both sides (especially at the hinge) You can clearly see the traces of friction 4: The hinge lacks oil to solve the problem

1. If the top is rubbed, loosen the upper two or one hinge a little, (or the lower two or one hinge are tightened a little) 2. Rub on the left. Collect the hinge in the middle, rub it on the right, and loosen the hinge a little. 3. The hinge is short of oil, find a wooden stick (lever principle), lift the door leaf up about half a centimeter, and apply oil to it (find a straw, suck it in and put it on).

Out of the inner door with the landlord's mother and son door--- solid wood door, white, just a set, own one. The anti-theft door at home is the mother and son door, and the inner door is unloaded to take up the space, and the need to give some manual fees on the line. [em10] self-pickup.