Staircase rail detls are given in this Autocad DWG drawing file. 8mm holes are provided for square pipe. 16mm square bars and 2.5” x2.5” square pipe is provided. 2mm thickness of mild steel plated is used. Other details are given in this drawing file. Download the autocad drawing file. Thank you for downloading the 2D AutoCAD DWG drawing file and other CAD program files from our website.