This ruler is specifically designed to create the following blocks: Grandmother's Fan, Dresden Plate, and Tumbler Blocks. Since this is a 22.5 Degree Wedge, 16 pieces will make a complete circle. All Good Measure rulers are designed to be compatible with each other, ensuring accurate cuts and allowing you to utilize these rulers for all your cutting needs. Each ruler is labeled with its size or the name of the specific job it does. Good Measure rulers are accurate, easy to read and versatile. Made in the USA! Ruler Size: 6.125" x 13"