I wanted M6 size, but I accidentally bought M8 size, so I'm selling it because it's no longer needed. Due to its unique shape, it's ideal for theft prevention. The purchase price was 4645 yen, and it took about 10 days to arrive, so it's a great deal for anyone looking for one. I also mistakenly purchased anti-theft nuts, so if you buy them as a set, you'll get an additional 500 yen off.