We are able to make the slewing rings with rolling element of balls,rollers and ball&roller combined.Diameter range from Min outer diameter 400mm. Till now,our largest production is outer diameter 6,019mm with outer gears.The most applications of our large slewing rings are for  harbour crane,ship cranes and other various material lifting&handling machinery.Please contact our sales person for more information-material,drawings,quality control,transportation,installation...