On Tue, 8 Jun 2010 18:06:14 -0700, "gray asphalt" wrote:

I'm a newbie. Wondering why the forstner drill bit sets
seem to increment by 1/8", with no 5/16 7/16 etc.

Cost? I noticed the same thing (needed a 7/16ths, so had to order it).
Sucks not having a woodworking store within 100mi.