Privacy mortise lock set with a 2 1/4" back set and equipped for a privacy thumb turn. The face plate measures 6" tall by 7/8" wide and the strike plate measures 5 1/8" tall by 1" wide. The lock box measures 4" tall, 1/2" wide and recesses 3". The on center measurement of the knob hub to the privacy thumbturn hub is a standard 2 1/4". This privacy function mortise lock is available in 3 different finishes.