The Sherline 55 Deg Insert DNMG 331 F1 is designed for use with the obsolete 55° Negative Rake Insert Tool Holder. This insert is characterized by its DNMG 331 F1 style, which aligns with the ISO number DNMG 110404-F1. It features an inscribed circle diameter of 3/8 inches, a thickness of .187 inches, and a corner radius of .015 inches. The insert is crafted from grade VP5615 material, ensuring durability and performance in various machining applications. This product is suitable for precision tasks requiring a negative rake angle, providing efficient cutting capabilities.