The Riley Blake Trim It Square Ruler 12.5, also known as the RILEY BLAKE DESIGNS Trim IT Ruler, is a versatile tool for quilting and crafting projects. This non-slip ruler features diagonal lines for easy block centering and colored outside 1/4-inch seam allowance marks for precision. With aqua and denim markings and 1-inch grids in 1/8-inch and 1/4-inch increments, this 12.5 x 12.5 inch ruler is perfect for trimming blocks, applique, and embroidery work. Make your quilting and crafting tasks easier and more accurate with this high-quality ruler.