Robotic arm factory biomech hand helper 3D model is available on CGTrader for $23. Original author: izydor-template.
STL (Stereolithography, filesize: 328 MB), OBJ (OBJ, filesize: 164 MB), 3DS (3D Studio, filesize: 328 MB), STP (STEP, filesize: 328 MB), FBX (Autodesk FBX, filesize: 328 MB), BLEND (Blender, filesize: 328 MB)