The Big Jammer Adjustable Door Brace features strong 20 gauge steel and is ideal for home, dorm, apartment or office use. This brace works on both hinged and sliding doors. It adjusts to fit most standard doors, and installs easily under your door knob to provide added security for your home or business. Its collapsible design makes it easy to store when not in use. This brace also includes a Security Bracing Pin for added strength.