Threading Insert Pramet, Negative Partial Profile, TN Insert, 22 Insert, Triangular, External, M, 3.5 to 5 mm Pitch, 1/2 in Inscribed Circle, 0.181 in Thickness, 0.866 in Length, ISO Code: TN 22ERN60 T8030, 60 deg Included Angle, Manufacturers Grade: T8030, Right Hand Cutting, Carbide, PVD Coated, Material Grade: H, K, M, N, P, S