Phillips Fiber Art 10 Degree Wedge Ruler.
Makes 50" circle when 36 wedges are sewn together with exact 1/4" seams. Seam allowances are included with the tool.
Ruler includes a pattern to make a tree skirt and is used in the book 'Quilts Without Corners' item # 5534.
Can also be used for the 'Spicy Spiral' Table Runner Pattern.