Terminal cup for loudspeaker subwoofer boxes. Gold-plated contacts for optimal signal transmission. Spring clips ensure a tight and secure connection. Rear connections use quick disconnect plugs. Positive (red) and negative (black) indicators to ensure correct wiring. The item is a set of 2pcs professional and practical 2-way speaker terminal round spring cup connectors, which are mainly made of sturdy plastic and gold-plated metal and designed for DIY speakers and subwoofer boxes. Gold-plated contacts for optimal signal transmission and spring clips ensure a tight and secure connection. It is easy to install with locking screws and simple to use. Functions 2 pieces of speaker terminal round spring, the cup connectors are sold together in one set. Color: mainly black. Material: durable plastic, copper and gold-plated metal. Cutout Diameter: approx 45mm (1 78 "); Overall diameter: about 75mm (3 '); Top-mount depth: 20mm (78 '). New and high quality 2-way speaker box terminal connector cover post round spring cup subwoofer plug. Terminal beaker for loudspeaker subwoofer boxes. Gold-plated contacts for optimal signal transmission. Spring clamps to ensure a tight and secure connection. Rear connections use quick disconnect plugs. Positive (red) and negative (black) indicators to ensure correct wiring. Easy assembly with locking screws and easy to use. Suitable for 4mm banana plugs, flat plugs or bare wire. Compact, reliable and durable. Package included 2 * DIY Home Car Stereo 2 Way Speaker Box Terminal Tie Down Round Spring Cup Connectors Subwoofer Plugs (Black)