2020 Aluminium extrusion files. I have uploaded STL, STEP Fusion360 and Solidworks versions. The Solidworks and Fusion360 files are native formats and will allow for direct import and adjustment.
The extrusion is at 300mm and the SolidWorks file has a material of Aluminium 1060 attributed to it.
This was originally designed in Solidworks as a native file and exported as both an STL, and STEP file.
The Solidworks file was also converted into a Fusion360 file to allow it to be used natively in Fusion360 as a fully defined parametrically adjustable file.