The Overlock Fabric Guide keeps your fabric edge neatly on track at all times. It helps you trim excess seam allowance evenly and gives your project a clean, polished look. It also supports you when sewing along a folded edge without cutting. You simply attach the adjustable guide to the knife cover and trim seam allowances up to 20 mm with precision. The fresh turquoise adds a stylish pop of color to your sewing space.