Easy Angle 4 1/2" designed by Sharon Hultgren.

Cut triangles, squares, and attic window shapes all from the same strip of fabric.
Cuts half square triangles from 1/2" to 4" (finished size)
Ideal for use with rotary cutter
Built in 1/4" seam allowance

Easy Angle 6 1/2" - Same great features as Easy Angle but cuts half square triangles and squares from 1/2" to 6".