its a center finder for stock. you place the tool (center finder) on the end of the stock that you want to find the center and bank the stock againts the pins on the center finder and draw a line across the end of the stock then roatate the center finder about 90 degs. and repeat the marking again.
and yes i own one got mine from rockler when i bought my dovetail jig.
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start square, finish square
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