1: OD: 89mm ( 3 1/2 inch) thread drill pipe 2: Connection:90mm/95mm/105mm 3: Grade: E75/R780/N80 4: Length: 9meters or as your requirement 5: Suitable for water well, geothermal well, gas well 6: Safe drilling depth: Within 800 meters 7: Tool joint:35GrMo/40Cr/4137H