The Riley Blake Seam Guide in red color, designed by Lori Holt, is a must-have tool for achieving precise 1/4-inch seams and constructing corner triangles with ease. This guide eliminates the need for marking fabric when sewing various shapes like half square triangles and flying geese. With 1/2-inch grid lines on the center circle, it allows for wider seam allowances and correct placement on your sewing machine bed. Easy to temporarily adhere, this guide is essential for any sewing enthusiast's toolkit.