Intruder defense door closer.

This is a device that slides over the door closer used on most commercial doors. The rational behind it is to prevent the two arms from being able to open, thus adding another mechanical lock in the event of an active shooting situation.

We've tested this, and it can be defeated with enough force. We recommend wrapping it with 5-10 layers of duct tape (or as much as you can get and still maintain proper clearance to slide it on.

This is designed to give you a couple of extra seconds in