This pair of Install Bay® IBWRD04P input wire reducers is a convenient solution for aftermarket audio upgrades in any vehicle. They each accept an input for 0 AWG and an output for 4 AWG wire that will fit into an amplifier's terminal. They provide a secure connection featuring hex screws and easy installation with no crimping required. | Install Bay | | IBWRD04P Single 0 AWG to 4 AWG Amplifier Input Wire Reducer, Pair | Black/Red | Best Buy