The middle door pulley bracket is made of metal, which is stable and durable; the roller part is made of high-strength engineering plastic, which has good wear resistance and stability. Function: These automotive hinges provide extra support for car doors, ensuring they remain stable and symmetrical in various conditions; Material: The hinges are made of metal, a compact and lightweight structure, and fine workmanship; Installation: These rollers are very easy to install, requiring no assistance, and are quick and convenient to replace; It helps to alleviate the jamming, abnormal noise or shaking of the sliding door during use and improve the operation of the door body., Manufacturer: PENGNAQP