Many of the quick-change drill accessory "speed chucks" utilize the groove
around the hex portion of the shank to allow fast tool/cutter changes.
These types of "speed chucks" typically have an outer sleeve that's pulled
back to release a ball or other latching device which allows the user to
change the tool/cutters quickly, instead of loosening the drill's chuck, and
then retightening it for each change of tool/cutter.

--
WB
..........


"Bob Engelhardt" wrote in message
...
Larry Jaques wrote:

Carbide bits are available ... http://tinyurl.com/48c32js ...

Ooo ... they have "Integrated Speed Load system". What??? ... how can a
drill bit have an "Integrated Speed Load system"? And what is it, for
that matter. Oh, I know ... it's a triumph of marketing over engineering.

Bob