ETIASQSA Sliding Barn Door Hardware Track Kit Basic Black Wheel Roller for Single Doors Garage Track System EIASQSA From production to processing, each product has been strictly tested by our professional staff thousands of times and put on the market quantitatively. High-quality product quality and performance are the key to your choice. Upgraded Nylon wheels Upgraded Nylon 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 Single Door Min Track Size= 2 × Single Door Panel Width Package includes Spliced track 1x pair Big wheel hunger 2x Door Stopper 1x Floor Guide Manual Roller screws and track screws Wheel diameter is 5.9'' Advange The spring limiter can reduce noise and prolong the service life of the door. The thickness of the door can be thicker for the screw that is screwed directly. Floor guide makes doors to slide more smoothly！ Track: width 40mm, thickness 5.5mm, Roller: Diameter 68mm, Roller board: width 140mm, thickness 5.5mm Hardware kit is suitable for door thickness 30-50mm, maximum load 330lbs The distance from the top of the door opening to the ceiling should be at least 21cm Distance from door to wall = 56mm - door thickness Before purchasing a sliding barn door kit, please measure the size of each door. The reference calculation method is as follows: Track length = 2 X single door panel width (if your door is 3 feet wide, you need at least 6 feet long kit）