Qt / Bh2 With Shank (3). The item Vertex Boring Head 100mm Metric Graduations 30 INT Shank M12 is in sale since Saturday, February 3, 2018. This item is in the category Business, Office & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Adapters & Holders\Boring Head & Adapters.