... . Impregnated core bit description: ModelRegular sizesSuited stratumInternational standardSingle tube impregnated diamond core bitΦ36,Φ46,Φ56,Φ75,Φ76,Φ91,Φ94,Φ110 ... ,Φ91,Φ94,Φ110,Φ130 AQ,BQ,BQ3,NQ,HQPQ,PQ3Wire-line impregnated diamond core bit and reaming shellΦ56,Φ59,Φ75,Φ91 ... higher abrasiveness strata. AQ,BQ,BQ3,NQ,HQPQ,PQ3Wire-line electroplated diamond core bit reaming shellΦ56,Φ59,Φ75,Φ91,Φ95 AQ ...