- Arc 20
This arc is a portion of a 20" circle. You will quilt a 20" circle using the inside curve or the outside curve. The laser etched lines are 1/4" to help you align the arc for evenly spaced curved lines or curved crosshatching. The light blue color helps make the etched lines easy to see on any fabric. This piece measure 13 1/8" X 4 1/4".