Simple Seam Wheel by Jen Kingwell Designs
Simple Seam Wheel is a clever little tool that assists in adding the perfect 1/4" seam allowance around home made templates. It is very useful for Appliqu and English Paper Piecing, along with a myriad of other uses in general sewing where you need to mark 1/4" seam.
It is very simple and easy to use, just insert pencil/marker through centre hole and move slowly around the template.