Features: Constructed from aluminum alloy, effectively unauthorized entry and enhancing your home's overall security. The portable door lock has an adjustable knob with a maximums adjustment ranges of 8mm, which can easily adapt to doors of different thicknesses and gaps. Unlocking and locking the door is easily with a simple pinch and pull mechanism, making it easy to operate even for those with limited hand strength. Designed to fit most inward opening doors, this lock is perfect for various locations including apartments, bedrooms, and patio doors. Note: Not for double, sliding or outwards opening doors. The door safety locks requires none 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.” Specifications: Component: Aluminum Alloy Color: Black/white Width: about 6cm/2.36inch Package Includes: 1pc Door Reinforcement Lock note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.