This newest creation from Elisa’s Backporch Design, Inc. works with 10" squares and 5" squares. The ruler is used to quickly and easily create accurate half square triangles in 4" and 1 ½" finished size. The ruler has a non slip surface and is marked in quarter inch increments to enable you to square up various sizes of blocks. As an added bonus, the ruler can be used to square up the seven inch drunkards path block created using Elisa’s 7” Crazy Curves template.