Looking for Functional chain and sprocket mechanism? Get this Polygon mesh 3D model from jaketnet2012 via CGTrader for $5.
JPG (JPG, filesize: 12.4 MB), PNG (PNG, filesize: 12.4 MB), MAX (Autodesk 3ds Max, filesize: 12.4 MB), IGE (IGES, filesize: 12.4 MB), SLDPRT (SolidWorks, filesize: 12.4 MB)