Pramet Turning Insert, TNMG Insert, 431 Insert, Triangular, 5 mm Maximum Depth of Cut, 12.7 mm Inscribed Circle, 3/16 in Thickness, 22 mm Length, 22 Seat, Negative Rake, FM Chipbreaker, 0.4 mm Corner Radius, 5.16 mm Hole Dia, Manufacturers Grade: T9315, ANSI Code: TNMG 431-FM T9315, ISO Code: TNMG 220404E-FM T9315, 60 deg Included Angle, 0 deg Relief Angle, Carbide, Material Grade: H, K, P, For Use On: Hardened Steel, Cast Iron and Steel