Sumder Carbon Steel 6.6FT Sliding Barn Door Hardware Kit (Black) Sturdy equipment turn your normal door into an innovative sliding door Fit door panel width: 36"; Door panel thickness: 1 3/8" and 1 3/4", Door capacity: 200lbs The rail hole-space is 16", 16" is US standard distance layout All other necessary hardware is included as you see in the pictures Product Guarantee: Replacement Parts for any damaged or missing pieces at no charge