This specific 3D model, "Door handle 3D model shop", is an asset made available by "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 625 KB), OBJ (OBJ, filesize: 70.7 KB), MAX (Autodesk 3ds Max, filesize: 413 KB), WRL (VRML, filesize: 123 KB), STP (STEP, filesize: 67.9 KB), SAT (3D ACIS, filesize: 50.7 KB), LWO (Lightwave, filesize: 47.8 KB), DWG (AutoCAD, filesize: 117 KB), 3DM (Rhinoceros 3D, filesize: 116 KB), IGE (IGES, filesize: 187 KB)