On Thu, 6 Feb 2020 14:08:24 -0500, Ralph Mowery
wrote:

In article , says...

On 2/6/2020 1:36 PM, Thomas wrote:
98mm is under 4 inches. What do you consider short?

Depends on size, thinner are shorter. You can find a few 18" ones here
https://www.mcmaster.com/extra-long-drill-bits




Just getting into this, at work we had some 1/8 inch bits and a few
other sizes up to about 1/2 inch that were about a foot long, some 1/4
and 5/16 inch bits that were about 5 feet long.
And I had a 2 1/4" that was 12 feet long - - - - Had to make that
one though.

"installer" bits of roughly 18 inch length are COMMON in smaller sizes
-3/16 to 3/8 sort of range - - some with a hole in the web at the tip
for attaching a wire or pull cord to pull it through the hole.