... .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 ... , 1.4016, 1.4401, 1.4539, 1.4828, 1.4876), Brass,Nickel, Monel, Hastelloy, Inconel, Silver, Bronze, Lead, Zinc3.Features & Service ...