Stens 340 178 Medium Lift Lawnmower Tractor Blade Pack of 4 4 replacement blades Super rugged and last Length 21 inch; Center Hole 5 pt. star; Width 2 1/4 inch; Thickness .149 inch Replaces Husqvarna, Craftman, Ariens, Poulan, and AYP 138971 with 42 inch Decks