What kind of door do you need for a safety lock.
If you have a hollow door, there is no reason to replace a lock tongue with another lock tongue. The door is very unsafe and the lock is important. When you replace the bolt on the unsafe inner door, it is best to use the locking door handle.
A two-cylinder bolt is required when replacing the bolt on the glass door (or part of the glass door). This is even more important if you want to replace deadlocks to upgrade security. Using the wrong lock on the glass door can make it easier for criminals to invade.