POWERTEC 128304 3-1/4-Inch HSS Planer Blades for Ryobi ZRHPL50K 51K, Set of 2 Replacement blades for HPL50K-30. Fits Ryobi 3-1/4-Inch planer HPL50K and HPL51K Made of High Speed Steel for longer cutting life Reversible knives have 2 cutting edges A set of two Calmshell packaging