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. Features: The unique design of the rollers reduces friction and noise, resulting in a smoother and quieter driving experience; Material: Made of metal, achieving a balance between lightweight and rigidity, thus enhancing the stability of the door; Installation: Designed for easy installation and convenient replacement of worn or damaged sliding door hinge roller assemblies; 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