This type of drill pipe is mainly suitable for the impact and rotation (including liquid and gas) drilling needs of the down hole hammer. It has the structural characteristics of high rigidity, good sealing, and flat outer surface. It has the advantages of low torque and low resistance during rotation. The main specifications include ¥ 50 × 1 meter; ¥ 50 × 1.5 meters; ¥ 73 × 1 meter; ¥ 73 × 1.5 meters; ￥ 89 × 1 meter; ￥ 89 × 1.5 meters; ¥ 114 × 1 meter& Emsp; ¥ 114 × 1.5 meters; It can also be processed as needed.