| The advantages: 
- marks on the swivel give a clear indication of inclination angels- additional ball bearing system allows for smooth swiveling under load
 - crimpfeature on the link prevents the link from kinking
 - both internal and external surfaces are protected against corrosion by a tough galvanized coating
 - improved swivel to surface contact is due to special machining
 - ball bearing wear can be visually recognized by the gap on the wear ring without measuring instruments
 - Secured four times against breakage in all load directions
 
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