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64mm 76mm T38 T45 89MM 102MM T51 115MM 127MM 140MM spherical tungsten carbide button bit thread hard rock drilling bit

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T38 T45 Ballistic Button Thread Bit

76mm T38 T45 Mining Rock Drilling Threaded Button Bit

R32 T38 T45 T51 High Quality Tungsten Carbide Button mining Thread Bits

Retractable Rock Drill T38 Thread Button Bits 64mm

T38 Thread Button Bits for top hammer drilling