Oregon 539614 Blade Double Wrapped MTD, 42" Complete set of 2 blades for 42 in. deck size-Fits 42 MTD Blade length (measured diagonally): 21- 3/16 in. Blade thickness: 0.187 in. Blade width: 2-1/2 in. Replace OEM blades: MTD: 742-04410, 742-4360, 7420616, 742-0616, 942-04308-X, 942-04312-X, 9420616, 942-0616, 942-0616-X, 942-04360-0684, 942-04410, 942-04410-0684, 942-4360