Function: the door can be locked from the inside and outside. The unlocked door can be opened from the inside with the door knob, but, from the outside, only with the key. Half fittings can only be used in conjunction with an apartment door lock.
door lever fitting made of polyamide/steel composite (steel core knob with steel base parts), to screw-on, wihtout pin connection to the lock nut, with flat caps. Concealed, lock tight screw.