Features: Make of Steel and ABS, precise size, waterproof and enduring. It will not cause the parts to break due to frequent sliding, which can ensure long terms use. Easy to use:The guide wheel of the kits is fitted with spring to secure them to the door opening. Press the builted in spring, the distance between the door and the track will be slowly adjusted to making it quickly into bracket and track to complete the installation. You can quickly replace and repair broken old door without replacing the door, suitable for repairing bifold closet door, sliding door, cabinet door and so on. Bifold door top guide wheel is commonly used bifold door replacement hardware in the parts. With precise size and excellent production, saving your preciously time. Specifications: Component: Steel and ABS Length: about 52mm/2.05inch Package Includes: 4Pcs Door Top Roller Guide Wheel 4Pcs Top pivots note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to difference between different monitors, the picture may not reflect the actual color.