... , casing bit, casing shoe bit, corelifter, corelifter case, core barrel assembly, inner tube head assembly, over shot, hoist plugs ... are applied in surface mining and geotechnical drilling. TT Series Core Barrels:Very thin cutting face allows very ... AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Core barrel assembly NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC