This rail is patterned after an "Open Source Design" by Bart Dring and Inventables. Please refer to the information contained in the SolidWorks Properties folder. It is entirely original and I used a photo of one of Bart Drings Extrusions to create the Model. Original files are available from Inventables but will not match my design. I doubt that any of my dimensions will be the same as his original open source design.