Save time with Sew Straight by sewing unmarked diagonal lines as Snowball or Triangle Squares. Accurately sew bias seams for binding in a jiffy! Sew perfect 1/4in seams! There are countless ways to use Sew Straight! Size is 5 1/2" x 5 1/2" Sew Straight comes with reusable adhesive tabs, but I'm going to use washi tape to secure mine....