PDC drill bits for mining 1,size:8 1/2" 2,6 blades 3,thread: ... /2" API REG 4,API certification PDC drill bits for mining PDC Drill Bit1,Type:steel2,Size: 8-1/2"3 ... formations.Feature:Improved support and retentionAdvantage:Manage the magnitude cutter loading and bit torque.Benefit:Improved bit durability and directional responsiveness1 ... 5/812 1/411612086 5/8Package: PDC drill bits for mining