Mulching Blade / John Deere GX22151Pack Size:1Husqvarna 578 43 19-11, John Deere GX22151, John Deere GY20850, John Deere AM137333Dealer Choice 50-3231, Home Depot 469318, J. Thomas DE-2215, Lowe's 228460, NHC 212-0456, NHC JD6016, Outdoor Factory Parts 578431909, Outdoor Factory Parts 578431911, Oregon 92-106, Rotary 11593, Sunbelt B1PD5016, Sunbelt B1JD6016John Deere 102, 115, 125, 135, D100, D110, D120D, D130, LA100, LA110, LA120, X110, X120, LA105, LA115, LA135 and Z225; requires 2 for 42" deckLength: 21 3/8 ", Center Hole: 7 pt. star, Width: 2 3/4 ", Thickness: .164 "