... , ball nose, twist drill, HSS tool bits, PCD diamond insert, gear hob,....Carbide Fixed-point Drill Bits 1, Suitable for Mould steel, Cast ... iron, Aluminum alloy, Copper, and Alloy steel processing. 2, Mainly for fixing ... )Shank Diameter(d)Flute Length(l)Overall Length(L)2D×2×4×50L224503D×3×6×50L336504D×4×8×50L448505D×5×10 ...