Subwoofer Terminal Binding Posts.   The terminals have there own set of threads, and can be installed into frames that only have two holes available for the terminals. Each terminal has two coloured washers, a solder tab with one hole, a lock washer and a nut. Technical Specifications Type: Spring Loaded Type with solder tab. Coating: Nickel Plated Length: 39mm Approx. These are sold as pairs, one Red and one Black