nq hq drill rod AQ NQ,HQ,PQ drill rod NW,HW,PW,NX,HX,PX ... standard ISO9001 certificate 3m nq hq drill rod(88.9*5.6mm) :we can produce NQ HQ diamond core bit,reamer shell,core barrel,drill rod ... rock drilling,well drilling.We can manufacture all kinds of bits and shells according to customer's special requirement. Any ... . Hope we can establish a good business relationship. 3m nq hq drill rod(88.9*5.6mm)