special use drill bits,drill bits Material: solide carbide, hss, hss-co Standard or as per requirement Technic:Fully Ground special use drill bits,drill bits,carbide bits1) Super high hardness, extreme smooth coating surface.2) Excellent performance in some sticky metals cutting (anti-sticky)3) Longer tool life.4) Work piece material: cast iron, carbon steel, alloy steel, hardened steel, quenched ...