Stanley 12-508 Replacement Block Plane Iron Cutter for Plane #12-331
The Stanley 12-508 Block Plane Iron Cutter features hardened, tempered high-carbon chrome steel which assures excellent edge retention.   Can be honed to a razor-sharp edge.   Ground to a flat surface for easy sharpening.  Comes with accurate ground edge of 25°; finishing with an additional honed angle of 30° is recommended.