... life. 3) 20 years manufacturer. 4) ISO9001:2000certificate.. King Bearing NNU49/710 :1) used in machine tools ,heavy ... construction machinery, oil drilling , metallurgy machinery,Mine , sailing and facilities for frontiers of science.2)ID Size is below ... construction machinery,oil drilling , metallurgy machinery,Mine , sailing and facilities for frontiers of science.MarketEurope,America,Middle East,Asia ...