Use for double door 2. The opening’s two sides don’t have enough space for sliding 3. Save ceiling spacer, only need 6” from the top of your door to the ceiling 4. Door weight capacity: 200lb 5. Door thickness for: 1-3/8″ 1-3/4″(35mm45mm) 6. We are professional factory, accept custom-made 6.6 FT(79 inches) kit’s included Total track: 1pc6.6 FT Roller: 4pcs Door stopper: 2pcs Track & wall spacer(with screws): 5pcs Floor guide: 2 Sets Anti-pad: 4pcs Prompt 1. Only the hardware is for sale, door is not included 2. Track’s length should be twice of your door panel’s width (you can use the track which is a little bit longer than your opening width) 3. The gap between inner door&wall is about 5/8”, the gap between two door panels is about 1 3/16” (based on door thickness: 1 9/16”) 4. Height from the top of the door to the ceiling is about 6”. Return: 90 days return time (If you did not like it or no longer need, under situation of the product does not affect the second sale that you could return to us) 3. We will timely solve your question within 24 hours 4. If you have any other ideas, please advise, we want to do better for you? About ZEKOO Single Track Bypass Kit? Design upgraded, only needs 6 ceiling space from top of the door to ceiling now. Better suited to smaller spaces and saves more space than side pull doors and traditional double track bypass kits. The kit has step-by-step instructions that will help you install the kit faster and easier. Why Choose ZEKOO? Black electrostatic sprayed carbon steel track, say goodbye to corrosion, rust, and scratch. Wheels are covered by nylon, bringing them great durability, vibration, and wear resistance. Bearings are made of high-purity Gcr15 steel, rigorously tested over 160,000 times, and secure the buttery smooth and quiet of the rollers when sliding. Heavy-duty Materials? Track is made from 1/4 solid high standard Q235 carbon steel. Both self-tapping and roller bolts are grade 8.8. These make our hardware kit can hold 230 lbs doors easily. Rubber covered Door Stoppers own a good buffer effect and also reduce the noise. Package List? 2 x 3.3FT Rail, 5 x Spacers, 4 x Rollers, 2 x Door Stoppers, 4 x Anti-jump Pad, 2 x Floor Guides, 1 x Step-By-Step Installation Manual, and some small accessories.