Mulching Blade / John Deere GC00344Pack Size:1John Deere GC00344, John Deere GC00175J. Thomas BL-0016, NHC 212-07703, Rotary 10458, Sunbelt B1JD1045John Deere JS60, JS60H, JS61, JS63, JS63C and JS63E walk behinds; 3245C rotary mowers; 21" deckLength: 21 ", Center Hole: 3/8 ", Outer Hole: 1/2 ", Center To Center: 2 ", Width: 2 3/4 ", Thickness: .119 "