2 installation ways that you can lock from the top of the latch or from the side, you can use them on different heights of furniture. 2 metal balls inside the roller, lock each other and open smoothly. You have added flexible screws on both sides which fix the locking part by tightening or loosening as you wish. High quality ball catcher made of metal. Good grips for long time use Easy installation and ideal for various cupboards, drawers, cabinets, cabinets, etc