... AQ NQ,HQ,PQ drill rod NW,HW,PW,NX,HX,PX casing pipe boart long year standard ISO9001 certificate 3m ... nq hq drill rod(88.9*5 ... HQ diamond core bit,reamer shell,core barrel,drill rod and other drill tool used for geological drilling,rock drilling,well ... can establish a good business relationship. 3m nq hq drill rod(88.9*5.6mm)