coring pdc bit 1.Type:coring bit,diamond 2.OD:28mm-150mm 3.long useful life, high efficiency, wide using range, PDC bit can be divided to core ... bit, non-coring drilling bit and anchor bit. This kind of bit has the advantages of ... , φ73-75, φ89,φ94, φ108, φ115, φ120, φ133, φ146, φ153 coring pdc bit