Buyer label offered ISO and SGS Certificate Good reputation Material : 50Mn , 42CrMo Excavator Slewing Rings ... , EX220-5, EX230-5, EX270-1, EX270-5, ZX230, ZX270EX300-2, EX300-3, EX310, EX300-5, EX330-5, EX370-5, ZX330, ZX370, EX400-1, EX400-3, EX400-5, EX450-5 ... -7PC300LC-7EO, Excavator Slewing Rings Bearing , slew bearing for Cranes and Excavators