Check out Reeded Mortice Door Knob 3D model on CGTrader for $6. High-quality mesh by Polygate: 13032 polys, 13026 vertices.
OBJ (OBJ, filesize: 246 KB), BLEND (Blender, filesize: 338 KB), C4D (Cinema 4D, filesize: 236 KB), MA (Autodesk Maya, filesize: 404 KB), MEL (Maya Mel Script, filesize: 404 KB), FBX (Autodesk FBX, filesize: 683 KB), MAX (Autodesk 3ds Max, filesize: 3.88 MB), 3DS (3D Studio, filesize: 120 KB)