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. The Quarter Square ruler makes quarter square triangles. However, it can also be used to square up blocks to 7.5", or to create a great border. Combined with the Half Square ruler (#GMHS ), it makes perfect Flying Geese blocks. Althought the Quarter Square and Half Square are both right angle rulers, they are used in different orientations. The Quarter Square is used when the straight grain is on the long leg ( hypotenuse ). The Half Square is used when the straight grain is on the short leg. 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 Measure rulers are accurate, easy to read and versatile.