Stanley No 9-1/2 Sweetheart Block is a high-quality block plane designed for precision and durability. This tool features an iron made from extra-thick 1/8" (3.18 mm) A2 steel, ensuring excellent edge retention for long-lasting sharpness. The precision-ground ductile cast iron base provides accuracy during use, while the Norris-type adjuster with a lateral locking feature allows for smooth and precise blade adjustments. Solid brass hardware enhances the overall smoothness and reliability of the adjustments. The blade for this block plane is model 12-143. With a blade thickness of 1/8 inch (3 mm) and a blade width of 1-5/8 inch (41 mm), it measures 6-7/16 inches (164 mm) in overall length and has a block width of 2-1/8 inches (54 mm), making it a versatile and effective tool for woodworking projects. Model Number: 12-143