Medium-Lift Blade / John Deere M136194Pack Size:1John Deere M136194J. Thomas BL-0018, J. Thomas DE-939, Oregon 91-079, Oregon 396-770, Rotary 10284John Deere F620, F680 and F687 Z-Trak; Z510A Estate Z-Trak; Z710, Z810A, Z820A, Z910A and Z920A Z-TrakPro series mowers; requires 3 for 48" deckLength: 17 ", Center Hole: 7/8 ", Width: 2 1/2 ", Thickness: .250 ", Heavy-duty