Clark ConVal Expansive Bit for Your Brace
This is a good used adjustable expansive bit. It is the graduated cutter model, with inch graduations to set the adjustable cutter to the size needed (cutter slides in a track into desired position, (where it can be locked down with a set screw). The range on this one is from 1-1/8-2.0" diameter, and has only one adjustable cutter insert included as in the pictures. It is marked on the shank "CLARK CONVAL CO EXPANSIVE U.S.A.". It is in very good used condition, no rust, shiney, sharp and ready to use.
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