The "ladder spiral staircase 3D model purchase" 3D asset is currently listed under the authorship of "Unknown author".
Can be downloaded at "Unknown platform" by following the link.
The licensing terms for this digital asset are governed by "Unknown license".
STL (Stereolithography, filesize: 120 KB), OBJ (OBJ, filesize: 102 KB), 3DS (3D Studio, filesize: 114 KB), DAE (Collada, filesize: 276 KB), FBX (Autodesk FBX, filesize: 210 KB), IGE (IGES, filesize: 298 Bytes), MAX (Autodesk 3ds Max, filesize: 211 KB), SKP (Sketchup, filesize: 430 KB), OTHER (Other, filesize: 116 KB)