$22 Spiral Staircase with Railing Architectural Detail 3D model by modernarchstudio. Available on CGTrader. Check it out on CGHub.
OBJ (OBJ, filesize: 259 MB), DWG (AutoCAD, filesize: 1.34 MB), 3DM (Rhinoceros 3D, filesize: 24.3 MB), 3DS (3D Studio, filesize: 51.7 MB), DXF (DXF, filesize: 9.22 MB), DAE (Collada, filesize: 102 MB), FBX (Autodesk FBX, filesize: 33.5 MB)