The item is 20pcs 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 transfer. Speaker box terminal a tight and secure connection. Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to proper wiring. Easy installation with screws locking and easy to use. Suitable for 4mm banana plugs, spade terminals or bare wire. Compact, reliable and . Color: Black Material: 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 20 x 2 Way Speaker Box Terminal Cup Only the above package content, other products are not included. Note: Light reflection 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.