POWERTEC 148031 6-Inch HSS Jointer Knives for Delta 37-205 37-220 37-275X, Set of 3 Replacement blades for Delta 6-Inch jointer 37-190, 37-195, 37-205, 37-220, 37-275X, 37-658 Made of High Speed Steel for longer cutting life Single edge A set of three; plastic case packaging Blade dimension: 6-Inch x 5/8-Inch x 3/32-Inch