The Square Up Ruler size is convenient and easy to use and allows you to square up your blocks to just the right size. It includes a laser precise 45° line on heavy acrylic and has 1/8”, 1/4”, and 1” lines. 1/4” seam allowance. *Product cannot to be sold on any 3rd Party site such as Amazon, Etsy, Ebay or any other 3rd Party sites.*