Pramet Threading Insert, Full Profile Negative, TN Insert, 11 Insert, Triangular, Internal, M, 1.25 mm Pitch, 1/4 in Inscribed Circle, 0.118 in Thickness, 0.433 in Length, ISO Code: TN 11NL125M T8030, 60 deg Included Angle, Manufacturers Grade: T8030, Left Hand Cutting, Carbide, PVD Coated, Material Grade: H, K, M, N, P, S