Aluminum Alloy Solid Material: -duty door reinforcement lock is made of high-strength aluminum alloy through one-piece, with an impact resistance of up to 800 pounds. It offers excellent anti-pry and anti-violent opening performance, providing a reliable safety barrier for homes, renters, and travelers Easy to Operate: The door safety flip lock serves as an auxiliary reinforcement device and can also be used independently. It is simple to use, with top and bottom grooves designed to fit the fingers for grip, requiring only one hand to pull and rotate horizontally to lock or unlock Adjustable Knob Design: The portable door lock features an adjustable knob with a maximum adjustment range of 8mm, easily adapting to doors of different thicknesses and door gaps. When rotating the knob, the built-in anti-slip rubber pad securely adheres to the door panel, preventing loosening or shaking No-Drill Portable Door Lock: The reinforced door measures just 2.4 inches in size and requires no drilling for installation, making it easy to carry during business trips or travel. It can be installed on the door of temporary accommodations, ensuring that every outing is accompanied by a "mobile security lock." Application : The safety door stopper is for inward-opening doors only, requires door frame lock slot ≥14mm. Ideal for hotels, dorms, apartments, bedrooms, private rooms. Note: Not for double, sliding or outward-opening doors. Please confirm the door type and lock slot dimensions before purchasing, Weight: 0.35053499658 Pounds, Manufacturer: NONDK