Designed by Erin Underwood, this 15 Degree Triangle Ruler is a must have for any sewist. Create Fans, Dresden Plates and much more. Simply sew together 24 of these 15 degree triangles to create a circle, 12 to create a half circle or 6 to create a quarter circle. This ruler measures 24.5 inches, allowing you to create circles up to 48 inches in diameter. Cut 30, 45, 60 and 90 degrees with ease. Equipped with Creative Grid's exclusive grip, this ruler slides easily on fabric yet stays in place when pressure is applied. Use the included instructions or scan the QR code to view a video demonstration. Made in the USA.