Crown's Dovetail Scraper in the Cryo treated version. It is specially designed to address the issue of accurately turning the required dovetail shape to match popular modern dovetailed chuck jaws. Stained black ash handle is approximately 10" long, and the tool has an overall length of approximately 15-1/2". England About Crown Cryogenic Tools Years ago tool makers discovered the enormous benefits of cryogenically (super-cold) treated tool cutters, especially plane blades. Now this technology has been applied to select Crown Turning Tools to bring a giant leap in turning tool performance. Cryo treating cutting tools alters the crystalline molecular form of key ingredients in the metal. This altered structure helps the metal achieve a vast improvement in wear resistance for longer life and longer edge retention, and a superior feel in use.