The Sew Easy Magic Seam Marker adds a -inch (0.65cm) seam allowance to any shape template. Just insert a pencil in the hole and roll gently against template edge. This is particularly useful for curved pieces such as drunkards path, clam-shells and circles.This handy tool will ensure that you can create high quality designs quickly and easily, allowing you to achieve a perfect and consistent seam allowance on a variety of fabrics. Works like magic!Pack size: 11 x 3 x 7 cm (4.3 x 1.2 x 2.8 inches)Creates a 0.65 cm (0.25 inches) seam allowanceParticularly ideal for curved piecesSew Easy Magic Seam Marker