Singer Precision Measuring Ruler – 12 inch Folding Ruler Product Features & Benefits: 12in folding ruler, folds to 6.63in for compact storage and travel; precision pencil hole markings; zero centering to measure equally left and right from a centered starting point; instantly marks your position with zero uncertainty; holes can be used for making even stitches and for aligning eyelets or buttons; accurate angle measuring – angle settings for measureing and constructing any type of angle.