Welcome to the forum, Keith. According the following link, the Eastwood dies are for a 22 mm (7/8") shaft.
http://www.eastwood.com/bead-roller-forming-dies.html
And, from the following link, the Harbor Freight is also 22 mm.
http://www.jalopyjournal.com/forum/t...roller.395197/
I would take this all with a grain of salt since I have neither, only Google.