Marti Michell Perfect Patchwork 6-inch to 16-inch Kaleido-Ruler. Use this large ruler for cutting triangles for Kaleidoscope blocks easily and accurately. Marti Michell templates include full size quilt templates of precision laser-cut 1/8-inch acrylic. A 1/4-inch seam allowance is already added; easy to follow purple and black markings. These wonderful tools are perfect for hand or machine piercers. Perfect for rotary cutters to cut multiple layers at once; smart corners so no more dog ears. Template measures 7-3/4-inch by 15-inch. Constructed of clear acrylic. Made in USA.