Pramet Turning Insert, TNMA Insert, 331 Insert, Triangular, 0.189 in Maximum Depth of Cut, 3/8 in Inscribed Circle, 3/16 in Thickness, 0.65 in Length, 16 Seat, Negative Rake, 1/64 in Corner Radius, 0.15 in Hole Dia, Manufacturers Grade: T5315, ANSI Code: TNMA 331 T5315, ISO Code: TNMA 160404 T5315, 60 deg Included Angle, 0 deg Relief Angle, Carbide, Material Grade: H, K, M, P, For Use On: Hardened Steel, Cast Iron, Stainless Steel and Steel