Hex gold pans. It's form in real metric system unit setup, ready for 3d print and use for prospecting gold panning. There are many size of pans, and 2 variants of depth - 3 and 2 inches(7.62 cm and 5.13 cm), and there are extended modification on bottom construction(forced). Also there are models with small riffles only(additionally).
Note: material editor has slot with bumped mtl(last sdcreenshot), use it if you want