Sandvik Coromant Turning Insert, 2-Sided Basic Shape, Series: T-Max, RNGN Insert, 55 Insert, Round, 0.157 in Maximum Depth of Cut, 5/8 in Inscribed Circle, 5/16 in Thickness, 15 Seat, Negative Rake, 5/16 in Corner Radius, Manufacturers Grade: 650, ANSI Code: RNG55T0820 650, ISO Code: RNGN150700T02520 650, 0 deg Relief Angle, Neutral Cutting, Ceramic, Uncoated, Material Grade: H, K, S, For Use On: Cast Iron, Hardened Materials and Heat Resistant Super Alloys