... ://www.yikuangdrilling.com, auger drill bits are devided into hard metal anchor drill bit and polycrystalline diamond compacts (PDC) ... speed greatly, and will replace hard metal anchor drill bit gradualy. working on the soft to medium hard rock formation(f ≤10), ... hole drilling in coal mine, transportation, hydropower, and so on.Characteristics: high wear resistance and impact-resistant toughness; long ...