Sandvik Coromant Threading Insert, Series: CoroThread 266, 266RL Insert, 16 Insert, Triangular Shape, Internal Thread, Acme Thread Standard, 8 Threads per Inch, 3/8 in Inscribed Circle, 0.156 in Thickness, ANSI Code: 266RL-16AC01F080E 1135, ISO Code: 266RL-16AC01F080E 1135, F Chipbreaker, Negative Rake, 60 deg Included Angle, Manufacturers Grade: 1135, Right Hand Cutting Direction, Carbide, TiCrAlN/TiN, Material Grade: H, K, M, N, P, S