QL60 Concentric Casing System Pilot Bit for 219mm Casing Pipe The QL60 Concentric Casing System Pilot Bit is purpose-built for overburden drilling with a 219mm casing pipe. As a core component of the ...더 보기
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219mm Casing Pipe QL60 Pilot Bit for Concentric Drilling System Foundation Mining Water Well Drilling