1)Model:114,117,127 2)material :high manganese steel 3)Certificated by API&ISO9001:2008 4) reasonable price Model ... 117 HAT127 HAT137 HAT147 GA114 GA126 GA135 GA145 TypeTricone bits, Steel tooth bits, PDC bits Applicable water well, oil field, construction ... , hard formation Bearing rubber seal or metal seal Packing wooden box, steel box, or as your requirements Payment Term T/T or L ...