Product description-Round Tube Sliding Library Hardware Rolling Full Set Track Kit,turn your normal ladder into an innovative sliding ladder. It is the best gift for friends and family.which perfectly solves the troubles and dangers of taking things from heights.Suitable for libraries, attics, study rooms, schools,storage rooms, closets, wardrobes, wine cellars, garages, office,store room,cloakroom,bookstore and living rooms.-Length: 3.3ft-20ft/100cm-600cm, more sizes can be spliced from these sizes, and the long slide rail is cut into several parts for easy assembly/disassembly/storage.- If any parts are missing or defective during transportation, please write to us and we will send replacements for the missing/defective parts free of charge in the first time.(No Ladder)Installation requirements:The location of the installation track, the board must be 8-10cm high (at least 8cm), and it cannot be installed if it is less than 8cm. The thickness is at least 3cm!