To ensure a smooth transaction, please read the profile before purchasing. If you purchase without confirming the details, the transaction or your rating may be affected. Thank you for your understanding. Set of two. I purchased these as spares, but I have no need for them, so I'm selling them. Naturally, there are no signs of use or scratches. The reach is slightly longer than the typical type, which can be convenient depending on the application. Approximately 10.5cm in total length. I use the same item with Nauticam and Olympus housing systems, and it's a general-purpose product that works without any problems.