Increases the pole height for use with a shelter. Its basically just a sleeved extension.

OP I'm fairly certain you cant put normal tech tips on the Distance series even if you wanted to. The pole sections on Distance (trail running) are thinner compared to the poles designed for trekking/mountain use. Obviously you can bring them into a store like REI and double check. I think the Leki tips are ever so slightly smaller in ID and are shorter so if you're going to try anything I'd try those. If you really want the BD ones then it looks like they're on Amazon. https://www.amazon.com/Black-Diamond-Flex-Tech-Tips/dp/B005FNCN98/ref=dp\_prsubs\_1?pd\_rd\_i=B005FNCN98&psc=1