Built in quiet spring systems and resistant aluminum alloys ensures smooth, rustproof operations, while the simple installation allows quick setup in under 5 minutes quiet door closure with our automatic door closing, featuring a noise reducing spring mechanism and durability aluminum alloys construction for long lasting in homes and offices Perfectly suited for interior / exterior door in bedrooms, bathrooms, kitchens, and commercial spaces requiring reliability auto closing functionality and resistance Combines and convenience with its auto shutting capability that prevents accidental open door, maintaining privacy and energy efficiency in any living or working environment Ideal for households with children / pets and enthusiasts seeking home security solution without professional assistance, Manufacturer: HVRFJXI