Rectangle Ruler, 6-1/2" x 24"The Omnigrid 6 1 2" x 24" folding ruler (R6524) features an extra 1 2" width for seam allowances and is used for cutting strips and trimming fabric edges during quilt making or when executing a variety of sewing and fabric craft projects. This ruler is used to cut 6" borders with seam allowances and to cut 6 1 2" strips for 6 1 2" blocks. It can also be used to cut strips, borders and bias pieces. In general, Omnigrid rectangle rulers are used for