For opening seams, to cut and remove stitches and to cut buttonholes open. The hardened steel blade will retain its sharpness. Ergonomic Large- 5 3/4'', including handle, long with blade that is electronically ground for permanent sharpness and features a safety ball to the tip to protect fabric. Soft grip design is easier to handle and the rounded shape fits comfortably in your hand. Lessens stress on those with arthritis or carpal tunnel.