DIYHD Top Mount Bi Folding Sliding Barn Door Hardware, Kit for 2 Doors(No Door). Black Hardware Only, Not Including Door Panel. Material:High quality carbon steel. Surface:Powder coated black. Track length Fit door leaf width. Suitable for door thickness: 1-3/8″1-3/4″. 34″/40″/46 are 1 piece track. 52″/60″/64″/68″/76″/84″/88is 2 short tracks combined together. The height from top of the door to the top of the roller is 5-5/16. Fit door width 15. Fit door width 18. Fit door width 21. Fit door width 24. Fit door width 12. Fit door width 14. Fit door width 16. Fit door width 20. Gallary for reference(4 doors). Gallary for reference(2 doors).