The file 'LetsPrintBaby American Flag Base With 10 X 3 Magnet Holes 3D Printer Model' is (stl) file type, size is 13.3KB.
This is just the base modified from LetsPrintBaby https://thingiverse.com/thing:4644060 for 10mm X 3mm magnets to be glued in. The rest of the files can be found at the original page.