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: The product employs weight distribution technology to evenly support the weight of the sliding door, preventing excessive pressure on the door and track; Structure: The sliding door rollers are made of metal, and the hinge rollers ensure consistent performance; Installation: These rollers are very easy to install, requiring no assistance, and replacement is quick and convenient; 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