Mitsubishi Materials USA Corp Turning Insert, CCMT Insert, 21.51 Insert, Rhombic, 1/4 in Inscribed Circle, 0.094 in Thickness, Standard Chipbreaker, 0.016 in Corner Radius, 2.8 mm Hole Dia, Manufacturer's Grade: US735, ANSI Code: CCMT21.51 US735, ISO Code: CCMT060204 US735, 80 deg Included Angle, 7 deg Relief Angle, Neutral Cutting, Carbide, CVD Coated, For Use On: Stainless Steel