This is a high-lift side discharge lawn mower blade, OEM part number 168720 (compatible with 175450/180583). Made of durable steel with a black anti-rust coating, it features a 6-point star center hole and fits 42-inch decks on Craftsman, Husqvarna and AYP riding mowers. The high-lift design creates strong airflow to expel grass clippings efficiently, making it ideal for cutting tall, thick or damp grass.