The Wing Clipper is a must have tool if you are making Flying Geese units for your quilt. This tool, and the associated Fast Flying Geese construction technique, allow you to make four finished units from five squares. The best part is that each unit is constructed slightly oversized so each can be trimmed to a perfect size with perfect seam placement once the sewing and pressing are complete by using the Wing Clipper tool. Every single unit will be exactly right every time. Now who ever thought that would happen with Flying Geese units?!?! Ruler size: 5½" x 10½". Ten unit size options: ½" x 1" to 5" x 10" finished units. All sizes are based on heights that finish to ½" or whole numbers.