Developed by Marsha McCloskey for precision cutting her Feathered Star patterns, this 8-1/2" square ruler is marked for cutting squares in 1", 1/2", 1/4", 1/8", and 1/16" increments --over 50 different sizes from 3/4" to 4-5/16". It can be used for squares, two triangle squares, and four-triangle squares (like the Precision Trimmer 6, only with a lot more square sizes). Fantastic for miniature patchwork as well as for Feathered Stars.