file format, fbx, sldasm, obj, step, max, sldprt.
original file format - 3dsmax, sldasm.
real world size (system units - mm)
MAX (Autodesk 3ds Max, filesize: 13.2 MB), OBJ (OBJ, filesize: 680 KB), FBX (Autodesk FBX, filesize: 1.08 MB), STP (STEP, filesize: 1.11 MB), OTHER (Other, filesize: 1.11 MB), SLDPRT (SolidWorks, filesize: 1.76 MB), JPG (JPG, filesize: 59 MB)