ITEM NAME:DIY Home Car Stereo Screw Cup Connectors Subwoofer Plugs 2-Way Speaker Box M8A3 DIY Home Car Stereo Screw Cup Connectors Subwoofer Plugs 2-Way Speaker Box M8A3 Terminal cup for speaker subwoofer boxes. Gold-plated contacts for optimal signal transfer. Screw type terminals ensure a tight and secure connection. Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to ensure proper wiring. The item is a set of 2pcs professional and practical 2-way speaker terminal round spring cup connectors, and designed for DIY speaker and subwoofer boxes. Gold-plated contacts for optimal signal transfer, and spring terminals ensure a tight and secure connection. It is easy to install with screws locking and easy to use. Material: durable plastic, copper and gold-plated metal. Cutout diameter: about 45mm (1 78 inch); Overall diameter: about 75mm (3 inch); Top-mount depth: 20mm (78 inch). . Color: mainly black. Suitable for 4mm banana plugs, spade terminals or bare wire. Compact, reliable and durable. Package Including: 2 * DIY Home Car Stereo 2-Way Speaker Box Terminal Binding Post Round Spring Cup Connectors Note: Light shooting 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..Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to ensure proper wiring. It is easy to install with screws locking and easy to use.