Delta 22-549 Replacement Knives for Delta 13" Planer Set of two high-speed steel double-edged, reversible replacement knives for Delta model 22-580 13" planer. Product Description 2 Pack, Replacement, High Speed Steel, Planer Knife, For Delta #22-580 Availability: Usually ships the next business day Delta 22-549 Replacement Knives 13" Planer 22-580 de22reknford