... in producing varies kinds of diamond core bits in different size, which are used in shale, ... , casing shoe bit, corelifter, corelifter case, core barrel assembly, inner tube head assembly, over shot ... AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, HQTT, PQ3, PQTT T2 series: T2 46, T2 56 ... productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC ...