Universal Brass Ground Joint Reamer - Griffin Glass Tools
This brass reamer is 7mm at a 1-10 taper which has been machined to a +/-0.001” tolerance. This This means when you ream a fitting it should be a nice snug joint connection with little effort. This universal reamer size range is just smaller than a 10mm fitting to just over a 19mm fitting at the widest point. Griffin's individually sized joint forming reamers (used for making glass on glass female fittings) have been very popular and have become very trusted for their effectiveness and accuracy.