A tool for setting the teeth of a saw so that they point in alternate directions.Center a saw set over every other tooth and squeeze the handle....
However, it is questionable how many gentlemen or other amateurs would find a use for the saw set, bickiron, bevel, or mortise chisel included in the larger kits, whose size and completeness were apparently selling points.
There are sections that cover the function of a saw set and the identification of different types.