Trim a large pipings seam allowance to an accurate 1/4in or 1/2in. The tool accommodates cording up to 3/16in to make piping finishing up to 1/4in and is designed to work with 28 45 or 60mm rotary cutters. The tool is 11.5in in length so users are able to trim 400in of piping in less than 20 min!