... ironstone, chert, abrasive rock etc. Including impregnated diamond core bit, surface-set diamond bit, reaming shells, casing bit, casing shoe ... drill bit. Reaming shells (with double pads or three pads) are suitable to use in all formation conditions ... new AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Diamond reaming shell NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC ...