This is Husqvarna's 300-3T Multi Grass Blade 578444501Fits the Following Models:135R, 142RB, 142RJ, 143R, 143R-II, 152RB, 152RJ, 153R 235FR, 235R, 235R-II, 236R, 240F (2007-Present), 240R (2007-Present) 241R, 250R (2007-Present), 252RX (2007-Present),...