Maximum Vertical Clearance Required: Ensure proper installation with a vertical clearance of at least 0.25 (1/4) inches and no more than 1.5 inches between the door and floor. Ideal for inswing doors with 3mm clearance, it includes a three-size spacer keyring set for a perfect fit. Easy Installation: No tools required! Simply position the DoorJammer below the handle, insert it under the door, and twist the screw clockwise for a secure fit. Quick-release feature allows for immediate removal by pulling upwards in emergencies. Suitable for Doors Weighing Up to 100lbs: Perfect for a range of door types, including interior, hotel, and travel doors. Designed to securely anchor to surfaces like tile, laminate, and carpet, providing reliable protection in any setting. Portable & Compact Design: Lightweight (227g) and compact (4.5” x 3.5”), the DoorJammer is easy to carry and store. Comes with a durable neoprene extension foot for extra grip on thick carpets, making it ideal for travelers and home use. Enhanced Security Features: Patented and award-winning, the DoorJammer provides industrial-strength protection against unwanted entry. Made of high-quality materials, it includes a stability-enhancing foot accessory and an easy-to-follow instruction manual for optimal safety. Enhance your security with the Portable Door Lock Brace from DoorJammer. Designed for home security and personal protection, the DJ3 - Standard model offers effortless setup and emergency release features. Simply position it below the handle, insert under the door, and twist the screw for secure installation. The quick-release mechanism allows swift disengagement in urgent situations. Versatile and reliable, this device anchors firmly to any surface, be it tile, laminate, or carpet, thanks to its unique hinge and angle system. The package includes a durable neoprene extension foot to enhance grip for doors with larger bottom gaps. Ideal for both travel and home use, it secures interior, hotel, and travel doors effectively. The DoorJammer requires a vertical clearance of at least 0.19 inches and is compatible with most internal doors with a 3mm clearance. It includes a three-size spacer keyring set to tailor-fit gaps above the door. Compact and lightweight, it’s perfect for carrying during travel, and its patented design ensures robust protection against unwanted entry. For optimal performance, ensure the DoorJammer is set on a flat surface. It may not fit properly on doors with risers, flashing, weather stripping, or seals. Each package comes with the DoorJammer device, a plush carry bag, a stability-enhancing foot accessory, a customizable spacer set, and an easy-to-follow instruction manual. Invest in your safety with the award-winning DoorJammer