The Peak Toolworks Endurance diamond finger joint cutter is strong enough to cut through all types of solid wood materials, including wood with knots or defects. It can be used for softwoods, hardwoods, structural and non-structural work. These diamond insert knives are designed with adjustable radial, lateral and angular run out. They can be produced up to 19 inches in diameter with 16 wings, making them adaptable to any project. It does not have to be sharpened between replacements.