Heavy duty, dual-function door security bar prevents forced entry on hinged, patio, and sliding doors; Door stopper security bar is intended for indoor useDoor security bar design is portable and compact making it easy to store and ideal for travel, providing enhanced security in hotels or on vacationAdjusts from 27-1/2 inch (70cm) - 42 inch (1.1m) to fit most standard doors and sliding patio doors. Top door knob jam is easily removed for sliding door applicationsMade with heavy duty 20-gauge steel for strength and security; Pivoting ball joint ensures door security bar has full contact with floor for secure fit while padded foot provides a strong grip without scratchingNo tools required, simply adjust the bar length using the release button, prop under door knob and easily adjusted as needed