... design results in better bit cleaning and cutting removal .5,Combined utilization of high performance PDC compacts significantly prolongs ... size(mm)Rock coefficientPDC core drill bitSingle pipe75/54.5 94/74 113/89 113/109 153/1291-18Two ... and underground foundation workFormationsticky, soft, medium hard, hard formationblade4,5,6,7,8,9Packingwooden boxPayment TermT/TMOQ1 PieceSupply Ability1000 Pieces ...