POWERTEC 148022 6-Inch HSS Jointer Knives for Craftsman 21705, Set of 3 Replacement blades for Craftsman 6-Inch jointer 21705 Made of High Speed Steel for longer cutting life Single edge A set of three; plastic case packaging Blade dimension: 6-1/8-Inch x 11/16-Inch x 1/8-Inch