6.6FT Colorful Sliding Barn Door Track Kit for 1 Doors, J Shape(No Door)6. 6FT Colorful Sliding Barn Door Track Kit for 1 Doors, J Shape Safety Ensuring Test Hausvita Upgraded Plated Metal wheels, each with 2 life time lubricated bearing ensure slide smoothly and quietly. Test beyond 120,000 rolls. You can use it for a long time! Easy to Install Strong hexagonal screws ensure that the 2 rails are firmly connected and can be securely mounted on the wall T Floor Guide Work for grooved doors,suitable for all thickness