Features: These binding posts are made from high quality alloy of good electrical conductivity and insulated with ABS plastic. Total 5 colors that you can use for color-coding, for example: red commonly means an active or positive terminal; black indicates an inactive or negative terminal, etc.Binding posts allow the connection of several different types of connections such as banana plugs or pin connectors.Commonly used on electronic test equipment to terminate (attach) a single wire or test lead. They are also great connectors on loudspeakers and audio amplifiers as well as other electrical equipment. Specifications: Voltage: <1KV Current: <5A Mounting Boring Diameter: 8mm Socket Diameter for Banana Plug: 4mm Color: Red, black, yellow, green, blue Quantity: 4pcs each color(total 20pcs) Package Includes: 20 x Binding Posts .