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: It reduces resistance and friction, keeping the door panel aligned during repeated use on daily roads; Material: The side sliding door roller guide kit is made of metal, giving the product high strength; Installation: This door hinge is designed for easy installation, conforms to standard specifications, and is quick and simple 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