I bought as et of these, hoping they would be big enough to hold the trucks on some HOn3 stuff I am scratch building.
if I drill the hole in the trucks out large enough for these screws, there will be no bolster left.
personally, I think these would work on HO, and probably O scale.
I can't imagine what they might fit on anything in N scale.
I don't want to give a bad rating on these, because I think they would be very good for holding trucks on.
but they are just too big.
I don't know, maybe they are mis labeled.