I have been using carbide end mills as boring bar or Jig Bore reamer. Carbide is ridged and produces a nice hole when opening up a drilled hole. I usually follow with a Carbide reamer for holes less tha 1/2" in diameter, usually less than 3/8" but on occasion 10mm, seems there are a few size metric Carbide end mills with 10mm shanks. I have quite a few 3/8" Moore tool holders that are 3/8". Would it be possible to open 3/8" to 10mm? Anyone know of a good source for metric Moore tool holders? I keep looking but haven't found any yet however my manual said they were available, probably overseas.