Estate item, never used, was on a shelf, with other items my friend had collected, 4 diameter boring head, Criterion clone, presumably made in China, no markings. I will list shanks separately, I have a straight and 30 taper shanks for this head.
Check out my other items. The item "4 inch Yuasa 515-204 boring head, 1 1/2-18 threads for shank, for 1 boring bar" is in sale since Sunday, December 12, 2021. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters".
The seller is "william_b_noble" and is located in Santa Monica, California. This item can be shipped worldwide.