What exactly is that for? Would I need that?
It includes three 6" sections of 12 guage wire in black, red, and yellow.
Black for the ground
Yellow will go to the battery for a constant 12 volts
Red will go to a switched power source for 12 volts when the bike is running.
He gives you 2 in-line fuses for the red and yellow leads, a piece of wire loom webbing to cover the wires, and some zip ties.
It is all the wire supplies you need to hook up the fuse box, but just not worth $34 IMO.
But all that aside, as I said originally, the Fuzeblock brand fuse box is probably the best accessory box available.