[Solid and Durable]:This single sided invisible door lock is made of thickened alloy material,which is sturdy and durable.It's not easy to break or age,ensuring long lasting use [Function]:Passage door knob has no locking function and turning on both sides,you can open and lock the door easily [Quiet and Comfortable]:The solid handle design provides a comfortable grip and operates quietly.great for maintaining a peaceful environment in your home [Smooth Round ]:The round design of the lock ensures smooth for operation without hurting your hands.Its are also rounded and smooth,providing a comfortable grip without any burrs [Versatile Use]:This passage door knob can be installed on various types of doors including bedrooms,bookcases,cupboards,etc.,making it a versatile addition to your home, Weight: 0.8928721611 pounds, Manufacturer: Zambuph