The Oregon 91146 is a genuine standard lawn mower blade designed for optimal cutting performance. Measuring 520.7mm in length and 57.15mm in width, this durable blade features a 15.875mm center hole and two 9.525mm outer holes with a 63.5mm center-to-center spacing. It is a direct replacement for various OEM part numbers, ensuring compatibility with AYP, Craftsman, Husqvarna, and Poulan lawn mowers equipped with 36, 38, and 42-inch cutting decks.