Mulching Blade / John Deere M154158Pack Size:1John Deere M154158, John Deere M112991Dealer Choice 50-2270, NHC JD5015, NHC 212-0658, Oregon 92-112, Oregon 91-403, Ratio Parts 22-964, Rotary 6186, Sunbelt B1JD5015, Sunbelt B1PD5125John Deere Tricycler mulch kit; requires 3 for 38" deckLength: 19 1/2 ", Center Hole: 11/16 ", Width: 2 1/2 ", Thickness: .203 ", Has round center hole and is interchangeable with OEM blades with star shaped center hole for this application