The item is a set of 2pcs 2 Way Speaker Box Terminal Cup Square Connector Copper Speaker Binding Post Screw Down Terminal Banana Jack and Plugs Subwoofer Plugs DIY Home Speaker Kits Home Stereo Speakers DIY Car Stereol, and designed for DIY speaker and subwoofer boxes. Terminal cup for speaker subwoofer boxes. Gold-plated contacts for optimal signal fer. Speaker box terminal ensure a tight and secure connection. Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to ensure proper wiring. Easy installation with screws locking and easy to use. Suitable for 4mm banana plugs, spade terminals or bare wire. Compact, reliable and durable. Color:Black Material: durable plastic, copper and gold-plated metal. Overall diameter: about 80mm (3.2inch) Cutout diameter: about 60mm (2.4 inch) Top-mount depth: 20mm (0.8 inch). Package Including 2 x 2 Way Speaker Box Terminal Cup Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.