roof bolt bit
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1)coal mining bit ,rotary drill bit
2)size:2-3/4"-26"
3)high quality and low price
1)coal mining bit ,rotary drill bit
2)size:2-3/4"-26"
3)high quality and low price
4)Be applicable to drill in imperfect stratum
5)The roof bolt bits are used to drill high-compressive strength,medium hard formations .