For production-ready use, we recommend downloading the source format.The converted file is intended for web viewing only. In the original file, the following are fully preserved:✔ full scene structure✔ complete materials without reduction✔ correct PBR texture maps✔ correct object namesIf you are going to integrate the model into a project, download the Original format.Golden Age Vintage Brass Interior Ocean Liner Porthole Window with articulating swing plate and 2 heavy locks