Sound Quest 0 to 4 Gauge Power or Ground Pro Style Wire Reducer Satin silver finish Converts 0 gauge wire to a 4 gauge pin Can be used with some amplifiers as direct inputs (I.E. amplifier accepts 4 gauge power wire, but you want to use 0 gauge. Depending on how close the power and ground inputs are together, you might be able to use this piece to convert from 0 gauge to 4 gauge. The key is that there is enough distance between the power and ground connections that when using these terminals, they do not touch) Allen head set screw Very heavy duty - Can be used for audio, marine and any under hood wiring