10″ Straight Edge with 1/4″ Indent. YouTube Video Instructions at – http://youtu.be/Gc8pZ92xZik. Excellent tool for use directly with longarm machines. This 1/4″ thick acrylic tool can be used to “Stitch In The Ditch”. Each edge is “indented” by 1/4″ to aid in proper placement on quilts. One end is round and can be used to create arcs and scallops. The opposite end contains a 45 degree angle for small crosshatching.