This transparent ruler allows you to see your project underneath for accurate positioning and measuring. 6" ruler on one side has 1/16" markings. Use this side to mark seam allowances, plats and placement for trims and stitching details. The other side has a 3" centering ruler with 1/4" spaced holes. Use this side to draw perfectly even scallops and circles, as well as space buttonholes. Compact 6" length is perfect to keep near your machine or tuck in a tote.