1.Steel or stainless steel 2.For boat trailer and box trailer 3.Size:as requirments Trailer couplers:1.Steel or stainless steel2.For boat trailer and box trailers3.Size:as requirments4.Load: 750/1000lbs5.This couplers for Australia, Europea, America

6.Plus coating or galvanizing for longer corrosion resistance or stainless still

7.CE Certificate/ISO 9000

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