Drill Pipe, Drill Rod, Diamond Bit manufacturer / supplier in China, offering Nq Hq Pq 1.5m-3m Wireline Drill Rod for Core Drilling Pipe with Material 4130 Steel, Nq Hq Pq Bq Diamond Core Drill Bit for Rock Sampling Drilling, Bq Nq Hq Pq Impregnated Diamond Core Drill Bit for Wireline Coring and so on.