This model is Door handle parts from SchoolHouse. please see the main product via this link:https://www.schoolhouse.com/collections/all-door-hardware
The FBX format was checked with Marmoset Toolbag. You can see the previews. there are 3 different materials. all the materials are PBR.all the model have been unwrapped for adding extra textures in future.
STL (Stereolithography, filesize: 1.95 MB), OBJ (OBJ, filesize: 2.84 MB), MAT (mat, filesize: 352 KB), ABC (Alembic, filesize: 1.91 MB), FBX (Autodesk FBX, filesize: 1.29 MB), 3DS (3D Studio, filesize: 1.07 MB), MAX (Autodesk 3ds Max, filesize: 9.5 MB)