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 shankless saw tooth, so the large bolt replaces the shank and threads directly into the tooth for the ultimate in efficiency. Quadco Saw Teeth are only available in the USA.