... :RoundSurface Treatment:BlackUsage:Pipeline Transport,Website:http://www.rejeedrilling.com, Oil&Gas Well DrillingTechnique:Hot RolledMaterial:Carbon SteelDrilling Depth:9000mThickness:6 ... : TK34, DPC, TC2000, TC3000Usage: Mine blasting, water well drilling, geothermal wells drilling, fore poling, coal and nonferrous metal mining projects, etc ...