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W-series casing tubes (API drill pipe) are made as per DCDMA standards, the most popular sizes are AW, BW, NW, HW and PW, which are widely applied in geotechnial drilling. Raw Materials: We choose the best steel tubes in the market to manufacture our drill rods and casing pipes. Instant check will be conducted after the raw material is received in our factory so that it can make sure the compositions and specifications meeting applicable stardard requirements. Remark: Length and threads depend on customer's demands.Casing Tube factory website:http://www.china-zjtk.com/drill-rods-and-casings/casing-tube/
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