Protect your home or office against unauthorized entry with the Big Jammer Door Brace. This heavy-duty, 20-gauge steel door stop provides security against unwanted intruders by installing easily under the door knob to prevent opening. Ideal for use in homes, dorm rooms, apartments or offices, the Big Jammer Door Brace is a simple, safe security device. The Big Jammer Door Brace adjusts to fit most hinged doors, and the end caps can be removed to allow for use on sliding glass doors. It features a baked enamel finish.