DJI Straight Extension Arm for Osmo Handheld 4K Camera and 3-Axis Gimbal Newly Coming Part 5For Rosette-Mounted AccessoriesMount Multiple Accessories at OnceOverview he Straight Extension Arm for Osmo from DJI allows you to use multiple rosette-based accessories at once. It attaches in place of the mobile device holder， and can be used with the Bicycle Mount， Universal Mount， and mobile device holder all at the same time.