... certificate & quality control. Surface-Set Diamond Bits are set with a singular layer of natural or synthetic ... can't be cored. Crown are used A to set with synthetic, natural or polycrystalline diamond. It ... BQ, NQ, HQ, PQ (Front end & Back end Type) T Series: T36, T46, T56, T66, T76, ... (); oProductShow.init( { 'aImgSrc': aBigImageSrc } ); } )(); Surface set diamond core bit NQ, HQ, PQ, NQTT, HQWL, T2, ...