Splicer/Reducer, Aluminum, Dual Rated, No. 6 - 4/0 American Wire Gauge (AWG), Made from high strength extruded aluminum alloy to provide premium electrical and mechanical performance, Tin-plated to inhibit corrosion, Rounded bottoms to facilitate taping, Solid center barrier prevents contact of dissimilar metal conductors, UL Listed for use up to 600 V and UL temperature rated 90 degrees celsius.