Hello, fellow Winston.
I have three of them - - 1/2" increments in both a 12" and 18" length and 1/4" in a 12" length. I love, love, love both 1/2" increment sizes. However, do not care so much for the 1/4" increment because you have to fold your fabric so many times for it to work. Don't know why June Tailor did not make it as wide as the 1/2" increment. They are particularly great for cutting multiples of strips if you don't have a die cutter.
KathDavis - you should do a Google search for June Tailor Shape Cut Ruler or go to this site for more information:
http://www.junetailor.com/videos.htm