My mother-in-law had one of these. She got hers through some county fair. It is supposed to help "flute" the edges of a pie crust. You lay it horizontal along the edge of the pie and press your dough in the curves, giving you same size, same distance on your pie crust. Not sure what the big hole was to be used for. Guess I'm too much like my mom---- Good cooks don't need contraptions like that to pretty up a pie!