The Oregon 91723 is a high-quality replacement mower blade designed for various Simplicity lawn tractors. This blade is engineered for durability and efficient cutting, providing a clean finish. It replaces several Simplicity OEM part numbers including 1708229, 1708229SM, 1708229YP, 1708229A, 1708229ASM, and 1708229AYP. Key technical specifications include a length of 533.4 mm (21 inches), a width of 57.15 mm (2.25 inches), and a thickness of 3.81 mm (0.150 inches). The blade features a 19.05 mm (0.75 inch) center hole and a 6.35 mm (0.25 inch) outer hole with a 95.25 mm (3.75 inch) center-to-center spacing.