we can provide the OD 2' non-dig drill pipes which has the strict requirements about bear torsion,tension,bending,friction. Shijiazhuang Longway Petroluem Drill Tools CO,.LTD The raw materials selected by our company are all the alloy structure steels for geographical usage produced by Bao Steel plant. After testing, both ends of the tube are thickened directly without welding. Then come to the ...