Specs: Length: 7". Includes top and bottom bearing and lock nut. 5 point star blade mount. Handy Hint: Install spacer, pulley then nut. Replaces OEM Number: Partner: 532137646; AYP: 532137646, 137646, 137645, 133172; Husqvarna: 532137646. Stens one-year warranty ensures reliability and performance for every part. Stens branded parts are trusted by professional dealers to perform OEM quality repairs.