A fuse holder must always be fitted at the battery end of the amplifier power supply. It should be fitted within 450mm of the battery. This fuse is to protect the car and passengers from a massive short circuit that would be caused in a vehicle accident or by a wiring problem. This fuseholder takes AGU type fuses, and is finished in Satin Nickel. The fuse holder can be used for both 4 AWG or 8 AWG cable.