The portable door has an adjustable knob with a maximums ranges of 8mm, which can easily adapt to doors of different thicknesses and gaps Designed to fit most inward opening doors, this is perfect for various locations including apartments, bedrooms, and patio doors. Note: Not for double, sliding or outwards opening doors The door 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 Constructed from aluminum alloy, effectively unauthorized entry and enhancing your home's overall security 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, Manufacturer: Xinsheinelry