8 1/2" Steel Tricone Drill Bits 1-API or ISO 9001:2008 2-Delivery Date ... with hard cherty streaks Model6-26( inch) TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field ... rubber seal or metal seal Packing wooden box, steel box, or as your requirements Payment Term T/ ... 617G12 1/4311.1437G, 517G, 537G, 617G, 627G, 637G17 1/2444.5517G, 537G, 617G, 627G, 637G API 8 1/2" steel cone ...