1,30 years experience in PDC bit manufacture 2,API&ISO 3,Fries-class quality with most competitive price 4,Tel:08615132793294 Size3"-26"Type PDC bits and diamond core bitsAppliablewater well, oil field, construction, geothermal, directional boring, and underground foundationFormationSticky,soft ,medium,medium-hard ,hard formationBearingRubber seal or metal sealPackingWooden box, steel boxPaymentT ...