... in engineering reconnaissance and ground processing. Impregnated core bit description: ModelRegular sizesSuited stratumInternational standardSingle tube impregnated diamond core bitΦ36,Φ46,Φ56,Φ75,Φ76,Φ91,Φ94 ... electroplated diamond core bit reaming shellΦ56,Φ59,Φ75,Φ91,Φ95 AQ,BQ,BQ3,NQ,HQPQ,PQ3 NQ/HQ Impregnated diamond core bit/Electroplated Diamond Core Drill Bit/Surface set diamond core ...