This is an indispensible, handy tool for everyone who sews with a sewing machine. Use it to position the machine's needle exactly where you need it, as well as to check the accuracy of the needle position for a perfect scant 1/4", 3/8", 1/2", 5/8" or 3/4" seam. It has a ruler with 1/8" markings and the 45-degree end is very useful when piecing your binding strips together.
