The 5388 kit has a Visionis DP104ND-FSA-LED normally closed drop bolt lock for narrow doors that provides 2200lbs of reinforcement with LED and time delay plus a power supply. The drop bolt locks into place, giving the protection needed to secure the door. Depending on how you want the lock installed, you will be able to give that “hidden” appearance, similar to the shear lock. When the drop bolt is given power, the bolt extends and locks into place.

This firmly secures the door as long as it has power going to it. With the time delay feature, you can set your delay to either 0, 3, 6, or 9 seconds. This particular drop bolt is fail safe; meaning that in the case of a power outage, the bolt will retract and the door will become unlocked. The power supply provided will allow you to hook it up right away.