I have a choice of numerous Scully Jones Power Tap Drivers. They are being sold as singles.The shipping will be FREE after the first one.  The sizes on the paper refer to the round shaft diameter of the tap going into them (actual measurement of the I.D. of the hole)..  Many machinists buy these and turn them down in a lathe to fit their own collet or chuck system..The last picture shows the Factory size of the Arbor shaft of 1.685" diameter..If you would like to buy a bunch of these, message me, or give an offer..Tell me what size you want.The sizes on the paper is of the round I.D. of the driver.There is a square drive inside for the Tap.. Here are the sizes.
1.235"
1.316"
1.520"
1.522"
2.103"
2.105"
1.615" square drive only
P.S. I have many other tool holders and drivers for sale.  ( Face shell mill tool holders )) ( Disc milling slot cutter mill ) ( Shell Face Mills and Holders ).( many large size Taps pipe and straight thread ).I will let you mix and match between my sales too.. I will package these right and ship right away. Let me know the Part you are choosing.