On Thu, 18 Jun 2009 09:56:04 -0500, Ignoramus18183
wrote:

I have in my possession an assortment of what looks like hammer drill
or air hammer bits (chisel end, point end etc) that have hex
shanks. The shanks are about 1/2" in diameter (I am going by
memory). I have never seen a tool that would take such shanks, any
idea what they are for?

My oldish AEG rotary hammer uses tools with a hex shank. An eccentric
pin in the hammer's socket loosely engages a shallow groove above the
tool's hex to keep it from falling out.

--
Ned Simmons