DEWALT DW7352-2 13-Inch Heat Treated Double Sided Replacment Planer Knives, 2-Pack Replaces the blades in the DEWALT DW735X 13-Inch, Three Knife, Two Speed Thickness Planer M2 laminated tool steel stays sharper and lasts longer than conventional knife materials Vacuum Heat Treating Provides longer blade life before user needs to flip to the second side New Grinding Process provides longer life with fewer nicks. Machined locator holes help users align knives on cutter head during knife change Great value with Two sets of knives in each Package