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1.Designs uniquely novel, 2.the bearing pressure bearing completely selects import, 3.good quality and using long time - details see: https://www.machineto.com/swivel-joint-for-kelly-bar-10256897

kelly bar drive head and upper fitting,which uses bearings to rotate kelly bar and prevent steel wire rop breakage.Designs uniquely novel,the bearing pressure bearing completely selects import,using for long time.It is suitable each kind to turn on lathe digs the drilling machine.