... ,best price 4.number of blade :4,5,6,7,8,9,... 1,Application:1,Suit for drilling medium to medium ... coefficientPDC core drill bitSingle pipe75/54.5 94/74 113/89 113/109 153/1291-18Two-pipes75/54.5 94/68PDC ... foundation workFormationsticky, soft, medium hard, hard formationblade4,5,6,7,8,9Packingwooden boxPayment TermT/TMOQ1 PieceSupply Ability1000 Pieces/monthDelivery Timewithin 7 ...