They were easy to fit and fit the drawer slides perfectly but one broke after 6 weeks. The previous ones lasted over 20 years. I'd love to recommend a better alternative, but I'm not sure there is one. Since the rail is mounted 3/4" from the case wall, I ended up attaching a 3/4" piece of wood to the case. and then screw the rail to the tree. This eliminates the need for less reliable mounts like these.