We get some Simpsons stuff in Europe (like nail plates and beam hangers) but I don’t think the screws are sold in Europe. If they were I don’t think it would be very easy to introduce a square bit screw in s as market where they are unknown.

And obviously, not much uses any imperial naming. I think this is regionally produced because e.g a beam hanger for 45mm timber has to be pretty close to 45mm and a 2” won’t do.