Pramet Threading Insert, Negative Partial Profile, TN Insert, 16 Insert, Triangular, External, M, 1.75 to 3 mm Pitch, 3/8 in Inscribed Circle, 0.137 in Thickness, 0.65 in Length, ISO Code: TN 16ELG60 T8030, Manufacturers Grade: T8030, Left Hand Cutting, Carbide, PVD Coated, Material Grade: H, K, M, N, P, S