If you want to download .obj or .step files you can do that here- https://cad.onshape.com/documents/e6da0a6f14582a596279b7cb/w/c25eed6ecbe2c448bb4c1c45/e/21371f2395f90157233ece57?renderMode=0&uiState=63d99d39e27cac43f4440549

Magnets = 1/16" x 1/2"

Screws = M3 x 10mm

I set support enforcers just under the screw head holes on the Air Tag Top stl.

Use super glue or epoxy to attach magnets.