... in producing varies kinds of diamond core bits in different size, which are used in shale, sandstone, limestone, marble, dolomite, ... certificate & quality control. 1.5m and 3m Drill rod & Casing pipe: Size Available: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, ... new AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Drill pipe NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC