Twister patchwork ruler by which you twist a lot of patchwork patterns in the Twister pattern (Square, Triangle, Hexagon, Quilt Star, Day and Night, Kaleidoscope). The length of the ruler is 11 "inch. It includes a video tutorial and a manual for sewing both Square and Triangle patterns. When sewing, you can choose the angle at which Twister will sew (25°, 20°, 15°, 10°). Recommended rulers in the Related section, at the bottom of the page.