Stens 340-066 PK4 Mulching Blades Pack of 4 Replaces OEM Part Numbers: Craftsman: 134149, Husqvarna: 532134149, 777134149, Poulan: 531307223, 532134149 Replaces OEM Part Numbers: AYP: 134149, 24676, 422719, 424752, 531005085, 531307223, 532134149, 532422719, 532424752, 539110460, 91724676, 917532422719, 917532424752, 917539110460, 917777134149, 954636867 Blade Specs: Length: 21", Center Hole: 5 pt. star, Width: 2 1/4", Thickness: .134" AYP: Requires 2 for 42" deck; Craftsman:Requires 2 for 42" deck; Poulan: Requires 2 for 42" deck; Poulan Pro: Requires 2 for 42" deck