Ideal Seam Gauge A wonderful tool to set accurate and consistent seam widths using the Ideal Seam Guide. Set your seam allowance accurately and consistently with ease! Simply drop the machine needle into any one of the 10 seam width holes and square up your Ideal Seam Guide. Remove the Ideal Seam Gauge and you are ready to sew so straight! This may well become one of the most valuable sewing tools you posses! Made of: Plastic Use: Seam Gauge