Price is for 10 Pc Box. Picture on display is of an Uncoated Insert. C520 (C-2): General purpose grade designed for cast iron and non-ferrous materials. C550 (C-5): Designed for heavy roughing to semi-finishing of all steels. CM-14 (C5 Coated): Multi Layer coating TiN/TiC/TiCN/TiN for turning and milling carbon and alloy steels and tool steels. Provides longer tool life than uncoated grades. Read More