KYOCERA Indexable Turning Insert, 2-Cutting Edge, Series: ISOI, CNGA Insert, #431 Insert, Diamond Shape, 1/2 in Inscribed Circle, 0.1874 in Thickness, 12 Seat, Negative Rake, 0.0157 in Corner Radius, 0.2031 in Diameter Hole, Manufacturer's Grade: KBN525, ANSI Code: CNGA431MEKBN525, ISO Code: CNGA120404ME, 80 deg Included Angle, 0 deg Relief Angle, Neutral Cutting Direction, CBN, Uncoated, Material Grade: H, For Use On: Hardened Material