Hmmm, let's not get into the discussion of small, tiny mechanical objects...
But on that note, I heard a story (not sure how accurate this is so beware) of a drill bit company that made very small drill bits. They made one the diameter of a human hair. ... Some time later, their competitor sent them a human hair with a hole drilled in it.
. -Gotta hate when that happens...
Off to work now. I'm in the shop all day with a job.
Ray