The No 7641 full mortise auxiliary bolt is designed specifically to secure pocket doors. It can be configured to operate cylinder-by-cylinder, cylinder-by-thumbturn, or thumbturn-by-emergency release. The faceplate measures 5-1/2″ x 1”. When ordering, specify a backset of 2-1/2″, 2-3/4″, 3-3/4″, 5″, or 6”. All Nanz plated and patinated finishes are available.