0 Gauge to 4 Gauge Amp Input Reducer Reduce amplifier input 1/0 Gauge wire to 4 gauge with ease Car Audio Accessories Made of high-quality brass with a marine-grade satin chrome finish for superior corrosion resistance 0 Gauge Terminals Easy installation with an Allen set screw design—no crimping required Perfect for amplifiers, multi-battery terminals, car audio systems, and multiple amplifiers Comes complete with 4 connectors, extra screws, heat shrink tubing for a clean and professional finish, and a hexagon tool for quick and easy installation 0 Gauge to 4 Gauge Amp Input Reducer 0 Gauge to 4 Gauge Reducer Amp Input Reducer 4PCS Heavy-Duty Brass Amp Input Reducers 1/0 Gauge to 4 Gauge - Durable Amp Connectors with Heat Shrink Tubing for Car Audio 4 PCS Heat Shrink Tubes, 4 PCS Connectors, 4 PCS Extra Srews, 1 PCS Hexagon Tool