Origin:CangZhou,HeBei HS NO.73042310 We sell API drill pipes with steel grade ranging from E75 to S135 and outside diameter ranging from2 3/8”to 5 1/2”, drill pipes with double-shoulder tool joint which have high anti-torque ability and BNK C95S drill pipes with special steel for sulfur containing well. The drill pipes are mainly for petroleum exploit in drilling of deep well, horizontal well and displacement well. We have got the API certificate.