It looks anodized and as far as I know you can only anodize Aluminum... so if it is I wonder how much you can crush the copper washer before you strip the aluminum threads
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'09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra // 
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