POWERTEC 148071 8-Inch HSS Jointer Knives for Delta 37-350 370380, Set of 3 Replacement blades for Delta JET 8-Inch Jointer DJ-20, 37-365, 37-250, 370380 Made of High Speed Steel for longer cutting life Single edge A set of three; plastic case packaging Blade dimension: 8-1/16-Inch x 13/16-Inch x 1/8-Inch