Drill pipes that are used in applications such as DTH/ DTHR/ DR basically comprise of a steel pipe with a pin at one end and a box on the other. The job of the drill pipe is to transmit rotational torque and thrust from the drill rig rotary head to down hole drilling tools. 
According to different application, different diameters of drill tubes are needed, basically, smaller DTH hammers need smaller DTH drill tubes, vice versa. Usually we are offering 50mm, 60mm, 76mm, 89mm, 95mm, 102mm, 114mm, 127mm, 140mm, 159mm.
Usually the threads are standard API connections, like 2 3/8" API REG thread, 3 1/2" API REG thread or API IF thread, etc. According to customers request, from 1000mm to 6000mm length of pipe are available. 

Boban provides a complete line of drill string products, including a full range offriction welded drill pipes in nominal sizes from 2-3/8" to 6-5/8" and in a wide range of wall thicknesses. Our drill pipe adopts a strict quality control regimen to ensure total quality control from initial material qualification, in-process inspection to final outgoing quality inspection. We ensure that each joint of drill pipe meets your needs for reliability, durability and performance.