Precision extruded commercial grade aluminum track features Johnson"s line-design fascia to hide finger marks and scratches or to hold paint if desired. Patented "tricycle" hangers with 1" [25mm] dia. wheels ride smoothly and quietly on convex shaped rails with single point contact. Hangers feature a quick disconnect clip system facilitating easy mounting or dismounting of door panels. Hangers are adjustable for height in case of settling.