For interior doors in residential, administrative and commercial buildings in public and industrial buildings, school buildings, etc., lightweight mortise lock for interior doors in the wooden area, visible parts blue galvanized, round faceplate, delrin latch with latch lock, not adjustable, bolt 1-turn 11 mm, without strike plate cut-out for tumble key (BB), key clipped onto faceplate Lock numbers 1-5 for right-hand DIN design Lock numbers 6-10 for left-hand DIN design