I live in a city, and the back door of our condo has a regular wood and glass door that swings inward and a iron security door that swings outward. The security door currently has a deadbolt which un/locks with a key on both the inside and outside.
We would like to replace the outer door, including switching to a deadbolt with a thumb-turn latch that doesn't require a key to unlock from the inside. This is required by law if we ever decide we want to rent out our place. The security concern would then be that someone could just cut the mesh and reach in to easily unlock the security door. To combat this, I've often seen security doors with a metal cylinder around the latch so that you cannot reach it and unlock it while the inner door is closed.
My question is, what is this guard around the latch called? I've tried searching and can't find any pictures of this type of latch guard. Not knowing what this is called then makes it impossible to find a door that has one. Is this something that I can even purchase COTS, or will I need a welder to make one custom for the door?