General description 2pcs DIY Car Stereo 2-way Speaker Box Terminal Spring Cup Connector is designed for speaker subwoofer boxes. It features gold-plated contacts for optimal signal transfer and spring terminals that ensure a tight and secure connection. The rear connections utilize quick disconnect connectors, and the positive (Red) and negative (Black) indicators facilitate proper wiring. Technical specifications Overall diameter: 93mm x 80mm (3.7inch x 3.2inch) Cutout diameter: 66mm (2.6inch) Top-mount depth: 20mm (0.8inch) Material: plastic, copper, and gold-plated metal Color: black Measurement allowed error: +/- 1-3cm Installation Easy installation with screws locking makes it user-friendly. Usage Compatible with 4mm banana plugs, spade terminals, or bare wire, making it versatile for various audio setups. Other information