Notched Hi-Lift Blade / Exmark 103-6403-SPack Size:1Exmark 103-6403, Exmark 103-6403-S, Exmark 103-6398, Exmark 103-6393, Exmark 103-6383, Exmark 103-6393-S, Exmark 103-6383-SJ. Thomas EX-21, Landscaper Express 36383, Landscaper Express 6403HD, Landscaper Pro 6403, Mow More EX11224Exmark Lazer Z, Ultra Cut Heavy Duty, Center Hole: 15/16 ", Length: 20 1/2 ", Thickness: .250 ", Width: 2 1/2 "