Parting Inserts for the GTN System. Grade Name: IC20 Insert Material: CARBIDE - UNCOATED ISO Range: K10-20 N05-25 S05-20 H05-15 ANSI Range: C2-C3 Grade Description: 'An uncoated carbide grade. Used for semi-finishing, finishing and semi-roughing of aluminum, cast iron and stainless steel. Used at low to medium speeds and feeds.' Grade Name: IC54 Insert Material: CARBIDE - UNCOATED ISO Range: P40 ANSI Range: C5 Grade Description: 'Suitable for milling, turning and planing at cutting speeds with large feeds; for machining in unfavorable conditions; permits use of sharp positive angles. Workpiece materials: steel, steel castings with cavities, austenitic stainless steel, stainless steel castings.' Grade Name: IC328 Insert Material: CARBIDE - PVD COATED ISO Range: P25-50 M30-40 S25-30 ANSI Range: C5-C6 C2-C3 Coating Description: TiN/TiCN Grade Description: 'A TiN/TiCN PVD coated tough grade. Used for milling, grooving, parting and drilling a wide range of workpiece materials, at low to