rock drill bit
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rock drill bit:
1.button bit: flat face/drop center
2.bit dia:32-127mm
3.water hole:3/2/4
4.Button type:hemispherical
rock drill bit:
1.button bit: flat face/drop center
2.bit dia:32-127mm
3.water hole:3/2/4
4.Button type:hemispherical/parabolic