The picture below attached showed our aluminum lock nuts. Black, red, blue, purple, pink, green, silver,orange, and gold color are our popular colors. Aluminum Flange lock nuts,aluminum Flange serrated lock nuts, aluminum self-locking nuts, aluminum hex nuts etc are available. But different Sizes and colors could be customized according to your draiwngs or requirements. Both 6061-T6 aluminum lock nuts and 7075-T6 aluminum lock nuts could be offered. If you need special packing service for the nylon washers including special package boxes, it is also ok for us. Any questions or demand, please feel free to contact us.