Oregon Fusion 3-N-1 Mulcher Blade For 42-Inch Cub Cadet/Troy-Bilt/Yard Machines/Yard-Man Lawn Mowers 498-629 Replaces OEM No. 742-0616 and 942-0616 Order 2 for a 42-Inch cut Blade length (measured diagonally): 21-3/16-Inch Center hole diameter: 5/8-Inch star, outer holes diameter: 5/16-Inch star, center-to-center distance of outer holes: 2-1/2-Inch Width: 2.50-Inch and thickness: 0.187-Inch