The ruler can be used on blocks from 7" to 18" in length. The border is pieced so it is easy to add a curved border to most any quilt. The curved border blocks are sewn in with the rows and the corner block is simply a 4-patch - how easy is that! I think it's an especially fun border for a child's quilt or on a table.
This quilt is made from the book "Dynamic Quilts with Easy Curves" by Karla Alexander. The pattern is "Well Connected". The version I made is smaller with just 9 blocks. Of course you can cut curves freehand, but the ruler makes it easy to put the blocks together with very little waste from squaring up. The end of each curve straightens out so the blocks are as easy to sew together as a 4-patch. I appreciate rulers like these that can be used for a variety of sizes and are so designed.