Sandvik Coromant Threading Insert, Series: CoroThread 266, 266RG Insert, 16 Insert, Triangular, External, UN, 12, 3/8 in Inscribed Circle, 0.156 in Thickness, ANSI Code: 266RG-16UN01F120E 1135, ISO Code: 266RG-16UN01F120E 1135, F Chipbreaker, Negative Rake, 60 deg Included Angle, Manufacturers Grade: 1135, Right Hand Cutting, Carbide, TiCrAlN/TiN, Material Grade: H, K, M, N, P, S