The ten degree wedge creates 50'' circular quilts. It is used in the book platinum quilts without corners and the patterns angelica and spicy spiral with more patterns on their way! Tool is 23. 5 inches in length. The center will have a 6 inch hole in the middle which you will applique over for a complete circle or leave open for a tree skirt! Free with the wedge tool is a lovely circular design ideal for a Christmas tree skirt.