The item is a 2pcs 2 Way Speaker Box Terminal Cup Square Connector Copper Speaker Binding Post Screw Down Terminal Banana 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 maximum sign transfer. Speaker area terminal a tight and safe connection. Rear connections use short disconnect connectors. Positive (Red) and destructive (Black) indicators to right wiring. Easy set up with screws locking and straightforward to use. Suitable for 4mm banana plugs, spade terminals or bare wire. Compact, dependable and durable. Color:Black Material: durable plastic, copper and gold-plated metal. Overall diameter: about 80mm (3); Cutout diameter: about 60mm (2 inch); Top-mount depth: 20mm (0 inch). Package Including 2 * 2 Way Speaker Box Terminal Cup Note: Light and varied reveals may cause the colour of the object within the photograph just a little different from the genuine thing. The size allowed error is +/- 1-3cm.