"David Combs" wrote in message
...
In article ,
Edwin Pawlowski wrote:


Most good twist drill can do both. For some applications I use brad point
bits for wood as they leave a flat bottomed hole.

What's a "twist drill" (bit)? How do I recognize one?

Ditto for "brad point bit".


The twist drill bit is the normal bit that you find with a twisted spiral on
the sides. The point is usually cut at 118 degrees and cuts most materials
well.

Brad points are actually a modified twist drill They work very well for
wood making a clean hole because of the way the tip is cut.
http://www.leevalley.com/wood/page.a...at=1,180,42240