This is for the battery extension tube for DART Flashlight. It allows you to use the larger 18650 battery.
Please note that the body tube only works when installed in one direction. Please read the latest DART User Guide before purchasing to understand how to install the extension tube: https://dapperdesign.com/pages/user-guides
*This is for the Extension Tube only. Batteries and DART flashlight shown in photos are sold separately.