I'm trying to figure out just what case they would be using to form the "9mm Nambu" that would require neck reaming given that the .38 Smith & Wesson case can generally be sized and the rim thinned, absolutely NO neck reaming required...
I think the case reamer and the forming die are for 8mm Nambu.
RCBS does have reloading dies for the 9mm Type 26 revolver cartridge (note proper name
)...
I think that neck reamer is mislabeled. I bet it and the form die are for converting .38 Special cases to 8mm Nambu automatic.