The Husqvarna 531007586 mulching blade set is an authentic OEM replacement part designed for specific Husqvarna riding lawn mowers with 42-inch cutting decks. This set includes two high-quality blades engineered to provide excellent mulching capabilities, finely cutting grass clippings and returning nutrients to the lawn. Each blade measures approximately 533.4 mm (21 inches) in length and features a 5-point star center hole for secure attachment. This genuine Husqvarna part ensures optimal performance and a precise fit for compatible models, promoting a healthier, well-maintained lawn.