1Brass Material: The amp input reducer is made of premium brass material, nickel plated, erosion resistant, scratch proof, can be used for a long time. 2Specification: Comes with 2 pair of power ground input reducers, the height is about 47mm/9in, and the screw wiring diameter is about 8mm/0.3in. 3Superior Craftsmanship: This wire reducer is manufactured to provide the performance and dependability you expect, keeps your amplifiers safe from accidental short circuits. 4Simple Installation: The amp input reducer pair is easy to install, no need for crimping, just use screws to clamp tight, convenient and fast. 5Application: Ideal for power or ground cables. Wire reducer can be used in most cars, effectively improving the quality of sound transmission.