This is a tool to find the center of a board or piece or metal stock. In use it's placed on the board with one set of the pins overhanging the edge, then rotated to bring both pins in contact with the edges of the stock. A center punch placed in the hole in the center piece is tapped and the resulting mark is in the center of the stock.
Numerous holes and two sizes of pins make it easy to set the tool for a wide variety of stock widths.
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