Stanley 1-5/8 in. Block Blade for 6-5/8 in. Block Plane is designed specifically for the Model 12-247 Plane, ensuring a fit and reliable performance. Crafted from hardened, tempered high-carbon chrome steel, this blade exceptional edge retention, allowing it to stay sharp through extended use. It can be honed to a razor-sharp edge for precision cutting. The blade is ground to a flat surface to make sharpening easy and features an accurately ground edge of 25°, with a finishing hone angle of 30° to optimize performance and longevity. Model Number: 12-508