On Fri, 28 May 2010 03:14:17 -0400, "Wild_Bill"
wrote:

Thanks for the direction. I found descriptions of the A and B taper masonry
drills.

A: 1" in 20 taper
B: 1" in 10 taper

http://www.icscuttingtools.com/Mason..._hammer_drills

I've seen hex and splined shanks, but was unaware of tapered ones.

And if you have a lathe and an adapter for your hammer drill that
accepts taper shank bits you can cut a taper on most any bit and use
it in your drill.

--
Ned Simmons