The SABRE Adjustable Door Security Bar is a heavy duty dual function security bar made from high grade iron that can secure just about any hinged doors sliding doors and/or windows. The security bar is fully adjustable with an angled padded bottom that assures full contact and strong grip on all types of floors without scratching them. The top door knob jam is removable for use with a sliding door. It s easy to use - simply adjust the bar length using the release buttons prop under the door knob and adjust as needed. No tools required! The Adjustable Door Security Bar is collapsible making it easy to store and travel with so you can feel at ease in hotels on vacation or even in your office. The hinged door length measures 28.5 to 45 (72.4 cm to 114 cm) while the sliding door length (without door knob cup) measures 25 to 41.5 (63.5 cm to 105.4 cm).