Replacement irons (blades) are available for all Stanley block and specialist planes. All Stanley replacement plane irons are made from chrome carbon steel which has excellent edge retention characteristics and allows a razor sharp edge to be honed. All cutters are fine rotary ground to give a flat surface that is easier to sharpen. G : Denotes suitable for old style planes. To fit 112020 and 112220 Planes 9. 1/2G and 220G. (old style) Cutter Size. 1.5/8in STA012508