Bi-fold door hardware is mainly made of steel and plastic materials which is strong and durable, waterproof and moisture-proof and avoids frequent sliding that may cause accessories to break, causing the folding door to slope or even fall, ensuring the service life of the door.The pivot and guide wheel of the hardware repair kit are equipped with springs, which can be fixed on the door hole. Press the built-in spring and the distance between the door and the track will be slowly adjusted, allowing it to quickly enter the bracket and track.