Pramet Turning Insert Pramet, CCMT Insert, 21.51 Insert, Diamond, 3 mm Maximum Depth of Cut, 6.35 mm Inscribed Circle, 2.38 mm Thickness, 6.4 mm Length, 6 Seat, Positive Rake, UR Chipbreaker, 0.4 mm Corner Radius, 2.9 mm Hole Dia, Manufacturers Grade: T9315, ANSI Code: CCMT 21.51-UR:T9315, ISO Code: CCMT 060204E-UR:T9315, 80 deg Included Angle, 7 deg Relief Angle, Carbide, Al2O3, Material Grade: H, K, P, For Use On: Cast Iron, Hardened Steel and Steel