Mulching Blade / John Deere M125413Pack Size:1John Deere M125413, John Deere M112738, John Deere M112972Green Meadow UJD14, J. Thomas BO-6122, Mow More JD21A, NHC JD507, Prime Line 7-06374, Sunbelt JD5007, Sunbelt B1PD1064, Sunbelt B1JD5007John Deere Silver 12SB, 12PB, 14PB, 14SE, 14SB, JA60 and JA62 with 21" deckLength: 20 7/8 ", Center Hole: 7/8 ", Outer Hole: 3/8 ", Center To Center: 3 11/16 ", Width: 2 5/8 ", Thickness: .119 "