General description Junction box for subwoofers featuring gold-plated contacts for optimal signal transfer. The spring-loaded terminals ensure a tight and secure connection, while the rear connections utilize disconnect connectors. Positive (red) and negative (black) indicators help ensure correct wiring. Technical specifications Overall diameter: approximately 93mm x 80mm (3.7in x 3.2in) Cutout diameter: approximately 66mm (2.6in) Top depth: 20mm (0.8in) Material: plastic, copper, and gold-plated metal Color: black Installation Easy installation with screw lock and user-friendly design. Usage Compatible with 4mm banana plugs and spade terminals. Other information Package includes: 4pcs DIY Home Car Stereo 2 Way Speaker Box Terminal Round Square Spring Cup Connector Note: Light shooting and different displays may cause the color of the item in the picture to differ slightly from the actual product. The measurement allowed error is +/- 1-3 cm.