Air Jet (IDF & IDA)
Jets are sized in "milimeters", so a "200" jet is very close to 2.0mm. Actually they are rated on flow not size, after they are measured on a flow machine. That's why drilling and reaming jets is not necessarily a good idea, since drilling or reaming can result in a 180 air flowing more than a 190 air, based on orifice length and entry/exit radius, etc.