HA! thats a machinists' joke.
hey- im not really a machinist, i just play one on the internet.
on with the pictures!
this is a tiny little boring bit i ground for small holes to be bored to a shoulder no deeper than a quarter inch or so.
going in for the kill.
these little widgets came out very nice. a nice fit for an M5 bolt.
it found its way onto a 5/16 x .035" 4130 tube.
which in turn became a canti-mount carradice support for the XO-2.