The Creative Grids 90 degree Double Strip Ruler helps cut half square triangles, quarter square triangles, 60 degree triangles and 45 degree kaleidoscope triangles from pairs of 2.5" strips sewn together into a 4.5" strip set.
Use the straight side of the double strip ruler to cut 1.5" and 2.5" strips, then sew together and make a 4.5" wide strip set. Turn-a-Round to cut three 90 degree triangles that finish 4". Cut multiple layers at a time. Key holes in ruler enable your rotary cutter to cut the sides without damaging ruler. The gripper holds fabric while cutting when pressure is applied.