... Point Contact Ball Slewing Ring is composed of 2 seat-rings, compact structure,light weight,and the ... Crossed Roller Slewing Ring is composed of two seat-rings, compact structure,light weight,small assembly ... Point Contact Ball Slewing Ring is composed of 2 seat-rings, compact structure,light weight,and the ... Roller Slewing Ring is composed of two seat-rings, compact structure,light weight,small assembly ...