... give optimum penetration rates and bit life, which is required to keep the cost of diamond drilling to a minimum. The ... the formation to be drilled. Size Available: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, HQTT, PQ3, ... = new AE.run.minisite.productShow(); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC