?Benefits?-- Solid brass. Gold plated. Heavy duty 5 Way Red & Black binding post with extended stud for up to 3/4" thick panel. Solder supply wires directly into bottom of binding post. ?Highlights?-- Unique crimping method produces a physically and chemically optimum contact point with low transition resistance, which ensures pure signal transmission. ?Easy Installation?-- The nut system is easy to install and can flexibly tighten the connector without worrying about loosening. Color coded black/red for maintaining proper polarity. ?Size Information?-- The conduction voltage is 100V - 240V. Suitable for 4mm banana plugs, spade lug connectors, and pin connectors or bare wire. ?Premium Quality?-- Milled from large chunks of solid brass, these binding posts are plated with 24 karat gold for an oxidation-resistant finish that perseveres over the tests of time. To help prevent accidental shorts or shock, these posts are fully insulated in a clear polycarbonate shell.