This mechanism is hidden behind the track, gently and quietly grabbing your barn door, similar to a soft closed drawer slide that is a great safe way to reduce the impact of the door on the end of the track. This product is designed for one-way operation. It appears in pairs, one for the left side and one for the right side. You should install 2 products on each side and then the door will stop gently when it is opened and closed. Ensure that the door hits the door side without noise or rebound. Suitable for all types of slides and metal box drawers, Weight: 0.3747858454 Pounds, Manufacturer: Aigend