... BQ,BQ3,NQ,HQPQ,PQ3Electroplated diamond core bit description: ModelRegular sizesSuited stratumInternational standardSingle tube electroplated diamond core bit and reaming shell ... in project. AQ,BQ,BQ3,NQ,HQPQ,PQ3Double tube electroplated diamond core bit and reaming shellΦ46,Φ56,Φ59,Φ66 ... abrasiveness strata. AQ,BQ,BQ3,NQ,HQPQ,PQ3Wire-line electroplated diamond core bit reaming shellΦ56,Φ59,Φ75,Φ91,Φ95 ...