Dritz-fons & porter half & quarter ruler.This easy to use ruler takes the math out of cutting half-square and quarter-square triangles.It lets you cut both types of triangles from strips rather than by cutting squares diagonally into triangles.This is a special ruler for scrap quilts because you use strips of even inch or half inch widths.You can cut squares from the same strips that you used for triangles.Cut perfect triangle from strips measuring 1in to 5in in width.Ruler features an acrylic construction with easy to follow black and yellow markings.Made in usa.