The radii on our double end corner rounding tools are profile ground, instead of the typical form ground radii on most corner rounding tools in the industry. Being profile ground insures round, true radius sizes with proper primary relief and clearance. Whereas form ground radii are only as round and true to size as the ability or skill to dress the radius on a diamond grinding wheel. We also grind slight flare as shown at each quadrant to avoid gouging the part on our Carbide Tipped Corner Rounder. Proudly made in the USA by AB Tools, Inc.