In article , dnichols@d-
and-d.com says...
In article .com,
himog wrote:
Grant Erwin:
Many many boring bars have square holes, one at 90° and one at 45°.-


None of the boring bars I have seen have holes in them for holding
cutters.

I think that you are confusing two things with the same name.

There are boring bars made to mount in boring/facing heads, and
I have never seen one of those with sockets for HSS tool bit. (Square
holes.)


Bridgeport boring heads came with this sort of bar, for
example...

http://www.hilcoind.com/flyers/Burnes/Catalog/21.JPG

Ned Simmons