... casing bit, casing shoe bit, corelifter, corelifter case, core barrel assembly, inner tube head assembly, over shot, hoist plugs, ... relative soft formation in using face-discharge bits. Simple construction and more resilient to damage than thin-wall ... AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Core barrel assembly NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC