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Gray is often simple, hehe, find a professional lock store master to help you change a set of handles that are fixed on the outside.
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Now there are such locks for sale?
There is a difference between double-active and double-fast, double-active means that the door can be opened by pressing the handle inside and outside the door without anti-locking, and the door can be locked by lifting the handle inside and outside the door.
Single-living means that the handle outside the door is fixed and dead, and it can only be opened with a key outside. >>>More
A single Grade A door is sufficient, and a double door is old-fashioned because it is inconvenient to have two door opening keys.
Which place? Generally, you can get wholesale goods in the building materials market! Cheaper than anywhere else!
There are many reasons why the security door fails, mainly depending on the quality.