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R25N Ground Engineering Tool Hollow Steel Self Drilling Anchor Hex Nuts
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R38 coupling / coupler R38 for for self drilling anchor rock bolt
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Self drilling rock bolt anchor plate for mine and tunnel roof support
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JCDRILL China Tungsten Carbide Bits Drill Rig Rock Bits Self Drilling Anchor Bit
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Rock Bolt Drilling Tunneling Anchor Tools Tungsten Carbide Self Drilling Anchor Bar Thread Rod Anchor Bolt