... aluminium washer,O-ring,Twin rings,heat shield Twin rings were developed for use with banjo bolts and rings 1.Washer Type: Copper ... washer,aluminium washer,O-ring,Twin rings,heat shield Twinrings were ... developed for use with banjo bolts and rings.2.Materials: Copper, Aluminium, AIMg3, AIMgSi1, Steel, Armco, Spring Steel ...