... ,517,547,617,637Applicable forPetroleum & gas, water well and mining Bearingmetal bearing(HJ), rubber bearing(HA)Advantagehigh quality with reasonable price because ... daysMain marketMiddle East, Africa, Europe, Asia, south AmericaReputation First, Client's Requirement First. How to judge the quality of the used ... tooth bits : API steel tooth tricone bits 7-7/8HA116 FOR OIL AND WATER WELL DRILLING