12” Breast Cancer Series. A portion of the proceeds will be donated to help fight breast cancer. The Add-A-Quarter with its specially designed lip, automatically adds the customary 1/4” seam allowance to any angle and provides a straight edge for your rotary cutter. Use your rotary cutter with templates, cut multiple layers, prevent template shaving, and cut any straight angle! Or in foundation piecing the Add-A-Quarter simplifies foundation piecing, works great to trim off excess fabric, and provides straight edge for placement of pieces.