Corona FE405506SC0CD 6-Inch Mill Smooth Cut File Size: 6, Model: FE405506SC0CD Superior Hardness - Carbon combined with precise heat treatment increases strength, yield strength Superior Resistance to Abrasion and Corrosion - Chromium added to increase the resistance to Superior Cutting Performance - More effective tooth angle and precise forming of the teeth Consistent Quality - More than 100 controls are performed on raw materials, products in process and Limited lifetime warranty