$11 Leg Shackles 3D model by edplus. Available on CGTrader with 25864 polys and 13156 vertices. Check it out on CGHub.
STL (Stereolithography, filesize: 46.7 MB), OBJ (OBJ, filesize: 46.6 MB), DAE (Collada, filesize: 47.1 MB), FBX (Autodesk FBX, filesize: 46.8 MB)