Japan OKK, which we own the general agent right , is well-known professional solid coating carbide-milling manufacturer, the C series high speed and high hard milling cutters they product, which can cut the HRC68 degree harden steel, suitable for high speed and high hard cutting. Categories: end milling, ball notes milling, end milling with R angle milling, slot milling, micro-diameter milling, straight-bladed milling, and so on