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Drill bit 219mm
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Bit diameter | 219mm |
Buttons | Spherical |
Bit front | Concave |
Hammer Shank type | DHD 3.5 Shank |
Applications: Medium hard to hard formations. Less abrasive, fractured formations. Excellent control over hole deviation.
Design feature: HD - larger gauge buttons. DGR - double (overlapPing) gauge row. Only from 8".
Typical formations: Granite, hard limestone, basalt.