Sandvik Coromant Threading Insert, Series: T-Max Twin-Lock, R166.39L Insert, 24 Insert, Rectangle Shape, Internal Thread, API Round Thread Standard, 8 Threads per Inch, 1/4 in Thickness, 24 mm Length, ANSI Code: R166.39L-24RD04-080 4125, ISO Code: R166.39L-24RD04-080 4125, A Chipbreaker, Manufacturers Grade: 4125, Right Hand Cutting Direction, Carbide, TiAlN/TiN, Material Grade: K, M, N, P, S