Mulching Blade / Exmark 109-5879-SPack Size:1Exmark 103-9613, Exmark 109-5879-SJ. Thomas BL-0029, Rotary 11791Exmark Lazer Z 72" Triton deck; requires 3 for a 72" deckLength: 24 5/8 ", Center Hole: 15/16 ", Width: 3 ", Thickness: .203 "