Our Woodturning Bowl Gouge flutes are individually inspected and hand polished to remove all machine marks. This extra step assures the sharpest cutting edge possible. The flutes are a parabolic U shaped with tapered sides not a deep V. U shaped gouges are great for either finger nail or bottom feeder grinds. Made from M42 Cobalt HSS heat treated to a hardness of 66-68 HRC, and tripled tempered. We use the American method of measurement for the stated size - diameter of the tool. They are shipped sharp.