Quite a simple accessory kit, the Power Rail Distribution Kit is designed to allow you to share your up to 3 rails around your system. They are deemed V+, GND, V-, but could be any rails, such as 5V, 3V3 and GND.
It does not generate the power rails - you'll need a separate power supply such as the Uber power supply (sold separately) for that, but once you've generated the supplies, it can be used to share the rails.
All the +'ve pins are connected, as are the -'ve and GND.
Painfully simple, but very useful.
The kit contains:
|3||Power Supply Distribution boards|
|3||40 pin headers, easily snapped down using a power snapper (sold separately)|
|12||12mm M3 plastic standoffs|
|24||M3 5mm Machine Screws|
|12||Screw Insulator Pads|
A printable footprint for the boards can be downloaded from here
Please ensure that you print it out in 1:1 ratio. It was originally designed for USA Letter Size paper, not A4!