The Brinks Dual-Functioning Door & Sliding Door Security Bar provides heavy-duty security for hinged, patio, and sliding doors to prevent forced entry. The quick and simple installation requires no tools. The door security bar adjusts in 40 different positions between 27” and 44.5” to fit most doors. It is constructed of 20-gauge heavy-duty steel for extra strength and security. The non-marring top yoke and pivoting padded foot protect your floors, doors, and locks while providing optimal security. This product works best on tile, wood, and concrete floors. The mobile and compact design makes this door security bar great for home, dorm room, travel and more. This comes with a lifetime warranty. From the Manufacturer The Brinks Home Security door jammer is adjustable in height from 25" - 43", the door jammer can increase your feeling of security in the home and fits both hinged and sliding doors. Brinks product is designed to keep your home, loved ones, and your valuables safe by exceeding rigorous testing standards and using the highest quality materials to provide you with years of worry free use. Lifetime warranty included.