Terminal cup for speaker subwoofer boxes. Gold-plated contacts for optimal signal transfer. Spring terminals a tight and secure connection. Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to proper wiring. * SODIAL is a registered . ONLY Authorized seller of SODIAL can sell under SODIAL listingsOur products will enhance your experience to unparalleled inspiration. SODIAL(R) 2pcs DIY Home Car Stereo 2-way Speaker Box Terminal Round Square Spring Cup Connector Binding Post Banana jack and plugs Subwoofer Plugs 93x80mm black Easy installation with screws locking and easy to use. Suitable for 4mm banana plugs, spade terminals or bare wire. Compact, reliable and durable. Overall diameter : about 93mmx80mm (37inchx32inch); Cutout diameter: about 66mm (26inch); Top-mount depth: 20mm (08inch) Material: durable plastic, copper and gold-plated metal. Color:black Package Including: 2 * 2pcs DIY Home Car Stereo 2-way Speaker Box Terminal Round Square Spring Cup Connector Only the above package content, other products are not included. Note: Light 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.