Bifold closet doors that are made from solid wood or composition material such as MDF (medium density fiberboard) operate the same way and use the same rollers, pivot pins and hardware. They wear out just like the tires and battery in your car or truck wear out and need to be replaced. This is where Tech Team's #937 Bifold closet door replacement hardware kit can restore your door to like new operating condition. The kit includes all the fittings necessary to restore one set of panels. This includes the top pivot and roller, bottom pivot, top and bottom pivot brackets, snugger, screws and instructions. When your door starts to get worn and goes "out of whack", using this kit is like giving your car a tune up.