Gear mechanism and chain.
STL (Stereolithography, filesize: 284 KB), OBJ (OBJ, filesize: 239 KB), 3DS (3D Studio, filesize: 110 KB), FBX (Autodesk FBX, filesize: 204 KB), IGE (IGES, filesize: 299 Bytes), MAX (Autodesk 3ds Max, filesize: 291 KB), SKP (Sketchup, filesize: 109 KB), OTHER (Other, filesize: 58.9 KB)