This is a locally made zipper jig, used to attach your zipper sliders onto your Zipper-by-the-Yard. It is small enough to take with you when you pack up and go to sew, at retreats, but if you want something more permanent in your sewing room, you can also mount it to a table or board. 1 Per package.
The second image in the gallery is a video to show you how to use it!