The Handi Quilter Ruler Straight Edge 3X12 is a high-quality tool designed for use on mid to long arm machines. Made of 1/4" thick acrylic, this ruler measures 3x12 and features guide lines that ensure accuracy while sewing. It can be used to sew straight lines, stitch-in-the-ditch, and diagonal lines with ease. Whether you're a professional quilter or a sewing enthusiast, this ruler is a must-have for achieving precise and professional-looking results.