From Manufacturer
The two-piece ONsite Aero V-Mount system from Tether Tools enables you to efficiently mount a long-lasting V-mount battery and an ONsite power supply to your Tether Table Aero laptop support. The power supply plate can also be mounted to a support arm or clamp via its 1/4"-20 thread.
Constructed from matte black aluminum, the set incorporates two 1/4-20 threads for attaching cable organizers or other accessories. The ONsite Aero V-Mount is designed to be used as part of a tethered workflow, helping you to view and save your photos on your on-set laptop.