Iscar Laydown Threading Insert, Series: ISCARTHREAD, 16IR Insert, Internal Thread, UN Thread Standard, 8 Threads per Inch, 3/8 in Inscribed Circle, 0.143 in Thickness, ISO Code: 16IRM 8 UN, 0.2 mm Corner Radius, Manufacturer's Grade: IC908, Right Hand Cutting Direction, Carbide, PVD-TiAlN Coated, Material Grade: C1, C2, C6, C7