This is a 250mm Oh-Ago Lock. ● This is an auxiliary tool for collecting Dorcus titanus and Prosopocoilus inclinatus using a scraping rod during sap collection or cave collection. ◉ Also, when scraping behind the bark of high-altitude tree cavities, by using the Oh-Ago Lock before scraping, you can prevent losing sight of the stag beetle even if it falls from the tree! We recommend using it to reliably collect large Dorcus titanus and Prosopocoilus inclinatus!! ● Hook the ring onto the inner tooth of the stag beetle's mandibles, pull the string with the bead, and secure the mandibles. ★ This is only an auxiliary tool for the scraping rod, so do not collect using the Oh-Ago Lock alone. ※ If you try to take out the stag beetle from the tree cavity using only the Oh-Ago Lock by shaking or pulling, you may damage the stag beetle's mandibles or break its legs. In the worst case, the mandibles may break. This is only an auxiliary tool to prevent the stag beetle from escaping deep into the tree cavity and to collect it with a scraping rod. ● Use it when you cannot take out the stag beetle from the cave with only a scraping rod as shown in the photo. Locking the mandibles prevents them from escaping deep into the tree cavity!! ○ Brass pipe, cotton thread ⚪︎ ★ After collecting the stag beetle by locking the mandibles, when loosening the lock, first slide the push lock under the rubber cap to loosen the ring at the tip. ★ When collecting, pull out the tip of the ring about 2cm with your nail. We were able to make it more affordable by simplifying the construction, so please consider it.