Powerful DHD, COP, Mission, SD, QL DTH Drill Bits 3-12''High Air pressure DTH hammer Drill Button Air Bits for saleBit choice: ø155, ø159, ø165, ø178, ø190, ø203 mmSp/span>Bit Head Design and selection:1. Flat front Srical Application: For Drilling in hard and abrasive rock.2. Flat front Srical + Ballistic Application: For Drilling in medium-hard to hard and moderately abrasive rock.3. Convex front Srical + Ballistic Application: For drilling in medium-hard and moderately abrasive rock.4. Convex front Ballistic Application: For drilling at high penetration rates in nonabrasive rock.5. Concave front Srical Application: For drilling in medium-hard, minimum hole deviation control.
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