Pramet Turning Insert Pramet, DCMT Insert, 21.50.5 Insert, Diamond, 0.039 in Maximum Depth of Cut, 1/4 in Inscribed Circle, 3/32 in Thickness, 0.307 in Length, 7 Seat, Positive Rake, FM Chipbreaker, 1/128 in Corner Radius, 0.114 in Hole Dia, Manufacturers Grade: T9315, ANSI Code: DCMT 21.50.5-FM T9315, ISO Code: DCMT 070202E-FM T9315, 55 deg Included Angle, 7 deg Relief Angle, Carbide, Al2O3, Material Grade: H, K, P, For Use On: Cast Iron, Hardened Steel and Steel