... formation to be drilled. Size Available: "Q" series: AQ, BQ, NQ, HQ, PQ/AQTK, BQTK, BQ3, NQ2, NQ3, NQTT, HQ3, ... NQ & HQ impregnated diamond core bit 6mm & 12mm Casing & Casing shoe bit NQ2 & NQ3 double tube & triple tube core bit Surface-set diamond core bit LTK48 & LTK60 drill ... (); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, T6, NMLC, HMLC