... .Verious sizes 5.Fast lead time Characteristics: YC impregnated diamond core drill bits are characterized by high efficiency and long ... Impregnated core bit description: ModelRegular sizesSuited stratumInternational standardSingle tube impregnated diamond core bitΦ36,Φ46,Φ56,Φ75,Φ76,Φ91,Φ94,Φ110 ... ,Φ75,Φ91,Φ95 AQ,BQ,BQ3,NQ,HQPQ,PQ3 natural diamond core bit/impregnated Diamond Core Drill Bit/Surface set ...