Split Rects. Use to make perfect pieced rectangle units every time. Ruler includes charts for starting strips and guide lines for cutting elongated triangles. Use the angled edge to cut and a trim down sections making it easy for each pieced unit to be quickly and precisely trimmed to desired size with perfect placement of the angled seam. Eight unit size options from .5" x 1" to 4" x 8" in .5" increments. For right and left handed use.