Grid stairs collection - 4 Free Samples Free 3D model is available on CGTrader for free. Original author: 3DCADengineer.
OBJ (OBJ, filesize: 35.2 MB), FBX (Autodesk FBX, filesize: 10.3 MB), PDF (PDF, filesize: 4.09 MB), F3D (Autodesk Fusion 360, filesize: 5.14 MB)