If you want to buy extra sets of J-Shape Hanger to install more doors, Please buy our J-Shape Hanger( B01FL9LFL2) ,This J-Shape hanger is compatible with our J-Shape sliding door hardware kit. ATTENTION: The package of this this hardware is about 6.75ft. If there is any part missed during the shipping, please feel free to contact with us and we will ship you the missing part as soon as possible. Installation Attention There is an error in our manual, please pay attention on the following 2 tips during your installation. 1,The lag bolt is for the wall with wood stud. If there is wood stud in your wall. Please don't drill holes in step 2 and just install the lag bolt directly in step 4. 2,The carriage bolt and the anchor is for the concrete wall. If your wall is concrete wall, please drill holes with 3/8" drill bit and the depth of the holes is 1 9/16". This new SMARTSTANDARD Country Black Steel Sliding Barn Wood Door Hardware can transform your doorway into a side sliding entry. This is a popular new way to bring innovation into the home and close off bedroom and side room in a stunningly unique way. 1. Hole spacer of the rail is 16". It is good for the wall stub. 2. Detailed instruction: use both words and pictures to display the steps of installing the barn door hardware. 3. All the measurements are in inch rather than in centimeter. 4. Easy to install and stable structure: one 6.6ft rail, rather than two short rails. 5. All our products have "Smart Standard" Logo on the package. Brand: SMARTSTANDARD IMPORTANT: Only Smart Standard is the legal seller of this product. All product from other sellers are fake imitation and not under warranty policy.