Offered here is a very long 1/2" reamer, by Reading Electric, NY. End of the 1/2" shaft is a 3/8 square, and the total length is 12".
This is used but looks serviceable, with no damage or corrosion. It was found rolled in oily paper, and the surface gloss is exceptional. Sold is as and as found. No returns.
Sales tax: Illinois residents must pay sales tax (6.5%).