The Good Measure name represents a high quality and accurate measuring system and the good that comes in the form of a donation to breast cancer research for every Good Measure Ruler sold. Make a difference while making something beautiful. Feel good about your choice to purchase Good Measure Rulers - the only rulers with a cause. This 4" square ruler is used to make straight cuts, to create square pieces, or to square-up completed blocks. Good Measure rulers make it easy for right- or left-handed users to position the ruler on the fabric. Abundant sight lines assure accurate fabric placement under the ruler. Notice the Clear Position Circle at the intersection of each line. Be sure the edge of the fabric is centered under that circle for accurate cuts every time! All Good Measure rulers are designed to be compatible with each other, ensuring accurate cuts and allowing you to utilize these rulers for all your cutting needs. Each ruler is labeled with its size or the name of the specific job it does. Good Measures rulers are accurate, easy to read, and versatile. Made in the USA!