I picked it up for $5 at an estate sale and cannot find any information on it. It has the Craftsman name on the very nicely finished metal box and on the 2 shafts and no other markings or part numbers. The round end pieces that snap onto the ends of the shafts are marked in sizes from 9/16" up to 1 1/4". I thought it was some kind of punch set but cannot figure it out. Any thoughts?