Old Key - Rusty Iron Material 4 Low-poly 3D model is available on CGTrader for $2. Original author: JhoJho. Specs: 532 polys, 554 verts.
STL (Stereolithography, filesize: 51.6 KB), OBJ (OBJ, filesize: 62.5 KB), BLEND (Blender, filesize: 894 KB), DAE (Collada, filesize: 133 KB), FBX (Autodesk FBX, filesize: 38.7 KB)