Notched Hi-Lift Blade / Exmark 109-6461-SPack Size:1Exmark 103-9605, Exmark 103-9605-S, Exmark 109-6461-S, Exmark 103-9598, Exmark 109-6461, Exmark 103-9600, Exmark 103-9615, Exmark 103-9598-S, Exmark 103-9600-S, Exmark 103-9615-S, Exmark 109-9391-S, Exmark 116-5497-SJ. Thomas BL-507, Laser 91902, Landscaper Express 39605, Landscaper Express 39600, Landscaper Express 39598, Landscaper Express 11776, Landscaper Express 1096461, Landscaper Express 392206, Rotary 12003, Rotary 11774, Rotary 11773, Sunbelt B1EM1873Exmark Lazer Z HP (600,000 and higher); Requires 3 for 50" deckLength: 17 1/2 ", Center Hole: 15/16 ", Width: 3 ", Thickness: .203 "