3" Square Ruler -Acrylic 1/8" Thick. Quilting/sewing Made in the USA 1/4" Markings, 60, 45, 30 Degree Lines. 3" Square Ruler has 60, 45, and 30 Degree markings as well as gridlines. 1/8" Thick - Clear Acrylic Markings are laser engraved for long lasting use.