This specific 3D model, "Door knob 3D print model buy", is an asset made available by "Unknown author".
You can download this asset for free at "Unknown platform" by following the link.
Usage of this 3d asset is subject to the "Unknown license" agreement.
STL (Stereolithography, filesize: 510 KB), OBJ (OBJ, filesize: 75.6 MB), DXF (DXF, filesize: 286 KB), AMF (amf, filesize: 510 KB), IGE (IGES, filesize: 510 KB), SLDPRT (SolidWorks, filesize: 388 KB), PDF (PDF, filesize: 388 KB), FBX (Autodesk FBX, filesize: 16.4 MB)