QualityParts From Oregon That you can depend on. Center hole: 5/8": Requires 1, 91-920 blade and 1, 91-919 blade for 42" cut; Rear discharge; Right-hand cut; High-lift: Aggressive blade angle increases air flow to push debris up and out for superior bagging or side discharge; Replacement for major brand: Walker; Oregon Equipment Parts 91-920 Blade Walker 25In Rh Low Lift