All of our products comply with strict quality control and advanced technology makes CCJH Sliding Barn Door Hardware more reliable. Material: Carbon Steel Door weight capacity: 220lbs Sliding Length: 4ft-16ft for your choose The top of the Doors to the ceiling : Min distance is 6.7″ Suitable Door Panel Thickness: 1 1/4″ to 1 7/8 inch. 1Adjustable Roller hanger screws(from 3cm to 5cm), You can adjust the screw to the most suitable thickness for your door 2Rubber accessoriers & Spring door stops, has buffering effect when sliding door, reduce noise. For Bypass 2 Door. 1 Pre-Drilled Spliced rails 2 2 x Rollers 3 Wall Hanger Set (1 rail hole need 1 set) 4 2 x Door Stops 5 4 x Adjustable roller screws 6 2 x anti-jump blocks 7 1 x floor guide. 8 Bypass brackets (1 rail hole need 1 set) Note: Only the sliding door kit for sale, door is not include. How to choose track size. 1 Single Door Min Track Size= 2 × Single Door panel Width. Double Door Min Track Size= 4 × Single Door panel Width. 2 doors just slide on the opening space, and cannot be put away to the near wall, Track size= 2 × Single Door Width. 2 doors overlapped onto each other can be slid to the one side wall, Track Size= 3 × Single Door Width. 2 doors can be slid on the either sides wall, Track size= 4 × Single Door panel Width. Any questions please tell us, Our customer service will help you within 24 hours.