The "Deluxe Corner Trimmer" by Marti Michell is A Quilters Swiss Army Knife. Quilters will use it to: replicate the From Marti Michell engineered corners on 4 common acute angles as well as square corners. Improve accuracy in piecing and eliminate bulk at seam intersections by trimming off dog-ears before sewing. Confirm angle sizes on templates and blocks. Mark a seamline for hand sewing, mark 1/4" seam allowances for "Y" seams or on your sewing machine. A 12 page instruction booklet is included with the tool.