Door Patio Lock Twist Lock Zp Diecast deadbolt lock. 5/16" diameter bolt has 1-1/2" long throw. Key locking feature. Throw bolt may be manually locked or key locked. Prevents forced entry. May be locked in ventilating position. Used on patio doors, sheds, or utility doors. Surface mou nted. Includes 1 lock and 1 set of installation screws.