Two hole panel mounting plate designed to hold two compatible panel mount products for easy mounting and installation. Compatible for models: PanelUSB, PanelCIG, PanelDVM & BS1016. USB charger and volt meter not included.
Read more: https://www.powerwerx.com/batteries-chargers/two-hole-panel-mounting-plate.html#ixzz3dB5phmyn
Manufacturer's Website