Take a drill bit. Point it's business end straight at your face and look
at it closely. See it's two cutting edges? Out by the periphery of the
drill, the cutting edges are next to helical gullets that run the length
of the drill. The center of the drill, though, is solid. This solid center
area is the "web". In that area, it's much harder for the drill bit to
do its work, that's why a pilot hole a bit larger than the web is really
helpful.

Grant Erwin

Jamie Jackson wrote:

IDAGS, but couldn't find out what the "web" of a drill bit is. Anatomy
lesson please? Also, you mentioned cleanup after the oil and before
painting: Mineral spirits?