... . Full spec. Series of product can be provided. Electroplated drill bits are also available for better performance in engineering ... diamond core bit description: ModelRegular sizesSuited stratumInternational standardSingle tube electroplated diamond core bit and reaming shellΦ36,Φ46,Φ56,Φ ... abrasiveness strata. AQ,BQ,BQ3,NQ,HQPQ,PQ3Wire-line electroplated diamond core bit reaming shellΦ56,Φ59,Φ75,Φ91,Φ ...