Specifications Manufacturing process: fully ground Material: Tugnsten carbide (K10, K15, K30) Spiral angle: 30º, 45º, 60º Flute: 2, 3, 4 Tolerance: h10 for outer diameter and h6 for shank diameter Finish: Bright, TiALN Diameter: 1-25mm Suitable for cast iron, cast steel, carbon steel, alloy steel, quenched steel(under HRC45)