The Johnson Hardware 138F Heavy-Duty ByPass Closet Door Hardware Kit features Precision extruded commercial grade .052 6063T6 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. 1" [25mm] high adjustable floor guide. 14 – 16 gauge zinc dichromate plated steel parts.