Made in the USA with high quality acrylic and precision measurements ensuring accuracy for your quilting, sewing, patchwork, and crafting projects. Creative Grids exclusive non-slip grip allows you to easily slide the ruler over the fabric until positioned correctly. Then, when slight pressure is applied, the grip holds the ruler in place, eliminating slipping while you cut. Easy to read black and white markings. Use the vertical lines to fussy cut stripes and to cut half-triangles. ¼in seam allowance is clearly marked down the middle of the ruler. Use the 30, 45, and 60 degree angled lines to create a variety of designs. Sew 16 of these 22-1/2 degree wedges together to create a complete circle up to 18in wide. Ruler slides easily over the fabric until pressure is applied. Then our exclusive grip holds the fabric in place while cutting, eliminating slipping and miss-cuts. Total Size – 4-1/4in x 9-1/2in This 22-1/2 Degree Triangle Ruler, designed by Erin Underwood for Creative Grids, makes short work of cutting those wedges needed for making Fans, Dresden Plates and more.