This caliper helps with sizing a tenon when using a Oneway Talon Chuck with the standard #2 jaws. On one side is the minimum diameter of 1 5/8" and the thickness is 3/16" which is the minimum length for a tenon, and on the other side there is the maximum diameter of 2 7/8" and maximum tenon length of 15/32". So as long as your tenon is between both ends in diameter and length it is usable.

MakerGear

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