Feature: 1. Widely Applicable: The power supply terminal is suitable for power or grounding cables. Wire reducers can be used in most cars, ships, yachts, RVs, etc., effectively improving the transmission sound quality. 2. Easy to Install: The wiring terminals do not require crimping, and are easy to install without the need for special tools or professional installation personnel. They can be installed independently and can be completed in a short time. 3. Tight Junction:The terminal block has been carefully designed to connect with the cable tightly, without leakage and other problems, and can protect the audio system. 4. Durable : The steel wire reducer is made of aluminum alloy, with good conductivity, high hardness, acid and rust resistance, and can withstand any harsh weather. It has a long service life and does not require frequent replacement. 5. Compact and Portable: The length of the wiring terminal is 50mm/1.97 inches, the diameter of the threaded ring wiring is 16mm/0.63 inches, and the weight is about 67g, making it easy to carry and reserve. Specification: Item Type: Amplifier Input Reducer Adapter.Wiring Hole: 1/0AWG to 4AWG Product Material: Aluminum alloy Fitment: For cars, ships, yachts, RVs Package List: 2 x Amplifier Input Reducer Adapter