Quadco saw teeth have become the industry standard around the world. Quadco saw teeth are made from high grade alloy steel, heat treated to the highest rockwell rating on the market without becoming brittle. Concave saw teeth are very efficient in non-impact harvesting applications (no rocks or gravel). This is a single piece saw tooth, so the shank is built into the tooth. This tooth fits the Ultimate 5600 Harvesting Head. Saw head disc uses 12 teeth. Quadco Saw Teeth are only available in the USA.