... formation rock which can't be cored. Crown are used A to set with synthetic, natural ... NQ, HQ, PQ (Front end & Back end Type) T Series: T36, T46, T56, T66, T76, T86 WF ... set diamond reaming shell NQ & HQ impregnated diamond core bit 6mm & 12mm Drill rod & Casing pipe wrench ... productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Surface set diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, ...