25mm aluminum extrusion modeled in Blender and drawn to real world dimensions. It comes in 3 different version. The Hi-poly version has 1969 polygons, the Me-poly version has 600 polygons and the Lo-poly version has 136 polylgons. These models are drawn 100 mm long, but they are easy to scale to increase the length as needed.
BLEND (Blender, filesize: 1.49 MB), OBJ (OBJ, filesize: 318 KB), FBX (Autodesk FBX, filesize: 165 KB), STL (Stereolithography, filesize: 347 KB)