Hi-Lift Blade / John Deere TCU14939Pack Size:1John Deere TCU14939J. Thomas BL-0008, NHC JD1051John Deere 657A, 667A, 717, 717A, 727, 727A, 7G18, 7H17, 7H19, F687, Z510A, Z645, Z810A, Z820A, Z830A, Z840A and Z850A; requires 3 for 48" deckLength: 17 ", Center Hole: 7/8 ", Width: 3 ", Thickness: .250 ", Heavy-duty