... ,PQ3Wire-line impregnated diamond core bit and reaming shellΦ56,Φ59,Φ75,Φ91,Φ95 AQ,BQ,BQ3, ... stratumInternational standardSingle tube electroplated diamond core bit and reaming shellΦ36,Φ46,Φ56,Φ75,Φ76,Φ91,Φ94,Φ110,Φ ... ,PQ3Double tube electroplated diamond core bit and reaming shellΦ46,Φ56,Φ59,Φ66,Φ75,Φ76,Φ77,Φ91,Φ ... core bit reaming shellΦ56,Φ59,Φ75,Φ91,Φ95 AQ,BQ,BQ3,NQ,HQPQ,PQ3 natural diamond core bit ...