The original door and fire sprinkler wedge from LINE2design. This is an idea wedge to shut the flow of an active sprinkler head off. The unique design, with ridges on the wedges works great when you use two wedges together. These also work on self closing doors, to hold doors open. It works better at the top of the door jamb. Depending on the door and the space on the bottom part of the door the gap my be to large for this wedge. Total length of each door and sprinkler wedge is 3 inch and about 3/4 inch high. Ideal product to add to any firefighters pocket for an assortment of tool and options.