Introducing the 13 in. HSS Planer Knives (4 knives) by POWERTEC. These heat treated double sided replacement 13 in. planer knives are made to exceed the OEM product. The innovative manufacturing process begins with the usage of high speed steel (HSS). The blade's high grade construction provides it with a hardness that is temperature resistant, while offering high wear resistance and anti-corrosive properties. Strict professional machining and quality control ensure superior sharpness, long lasting durability and precision cutting. Double Sided to Last Twice As Long: Our planer knives feature a dual-sided double edge blade designed to provide you with sustained planning on each side, before turning them over to the other side. Ultimately, this will help save you both time and money while delivering professional looking results for your woodworking projects. SPECIFICATIONS:. Material: Premium High Speed Steel (HSS) from Europe, Size: 13-1/8 in. x 1/2 in. x 1/16 in., Cutting Edges: 2, Blades Per Set: 2, Package: POWERTEC Reusable/Storage Case Packaging. PRODUCT COMPATIBILITY: These replacement blades can be used exclusively for the Delta 22-549, 22-555, 22-580 Thickness Planer, Grizzly 13 in. Planer G0689 and Craftsman Planer 21743.