Amon Speaker Rivet Nuts - Set of 4 New, Unopened These are rivet nuts for speakers, purchased for DIY use in my previous car. I intended to use them, but I ended up changing cars, so I've been storing them for a long time. The speaker terminals in the image are also unused. Please feel free to use them if you have a need. They are new and unopened, but please check the images and make your own assessment. I would appreciate it if those who understand their purpose and compatibility would consider purchasing them. Thank you for looking. I hope to have a good transaction with someone who can conduct business honestly according to Mercari's rules.