Stanely irons for 912 amp 220 planes stanley 0 12 331 replacement irons blades are available for all stanley block and specialist planesall stanley replacement plane irons are made from chrome carbon steel which has excellent edge retention characteristics and allows a razor sharp edge to be honedall cutters are fine rotary ground to give a flat surface that is easier to sharpeng denotes suitable for old style planessize 40mmto fit 1 12 020 and 1 12 220 planes 912 and 220 stan