Creative Grids Wonky Square Quilting Ruler: 22.5 Degree Skew for 6in Finished Block The Wonky Trim Square is a companion to the Wonky Triangle (#CGRAU1). Cut 4 Wonky Triangles, sew them to a 6 1/2" block to skew 22 1/2 degrees. Place the lines on the Wonky Trim Square on the seams of the block to trim to size. Seams of adjoining blocks will match every time. http://www.youtube.com/watch?v=6TvpzIbqMqQ&feature=player_embedded