Mulching Blade Width: 2 3/4 ", Thickness: .164 ", Center Hole: 7 pt. star, Specially designed: to replace 7 pt. star center hole, Packaging Type: Branded label, Length: 21 3/8 ". Replaces Part Numbers: John Deere GX22151, John Deere GY20850, John Deere AM137333, Husqvarna 578431911, John Deere AM141033, John Deere AM137328. Stens Part Number: 330-441