A bolt and nut created by solidworks and materialized by 3ds max corona, all material assets are contained.materials are easy to make even if you don't have corona renderer installed you can easily remake them.
MAX (Autodesk 3ds Max, filesize: 3.73 MB), OBJ (OBJ, filesize: 1.19 MB), FBX (Autodesk FBX, filesize: 531 KB), 3DS (3D Studio, filesize: 724 KB), SLDPRT (SolidWorks, filesize: 1.92 MB), DWG (AutoCAD, filesize: 725 KB), ABC (Alembic, filesize: 2.55 MB), IGE (IGES, filesize: 1.5 MB), DXF (DXF, filesize: 6.2 MB)