Please read the profile before purchasing. Important requests regarding transactions are stated. Your understanding and agreement with all of them are key to a smooth transaction, so we appreciate your cooperation. This is the price for a set of two. I purchased these as spares, but I'm selling them because I have no opportunity to use them. They are unused. They come with a shackle and have a slightly longer reach than the usual type, which can be convenient depending on the application. Approximately 10.5cm in total length. I use the same ones with Nauticam and Olympus housing systems, and they are general-purpose products that work without any problems.