Stanley plane irons stanley 0 12 133 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 134into fit 112033 plane sb3 stanley 0 12 133 iron for sb3 134in