For mortice knobs - Where possible we recommend a minimum latch / lock, depth of 102mm To clear your knuckles away from hitting the stop on the door frame, when closing the door.
This door knob is unsprung and requires a double sprung tubular latch.
For any key locking internal doors where mortice knobs are being fitted we recommend fitting a horizontal mortice sash lock.
For any bathroom doors locking via a thumbturn system we recommend fitting a horizontal bathroom mortice lock.
Grub screw fixing to spindle for extra strength on the door