The item is a set of 2pcs professional and practical 2-way speaker terminal round spring cup connectors, which is mainly made of durable plastic and gold-plated metal, 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 and easy to use. Features - 2 pieces of the speaker terminal round spring cup connectors in one set will be together. - ColorBlack - Material: durable plastic, copper and gold-plated metal. - Cutout diameter: about 45mm (1 7/8 "); Overall diameter: about 75mm (3"); Top-mount depth: 20mm (7/8"). - and 2-Way Speaker Box Terminal Connector Binding Post Round Spring Cup Subwoofer Plug. - 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. - Easy installation with screws and easy to use. - Suitable for 4mm banana plugs, spade terminals or bare wire. - Compact, reliable and durable. Package list: 4 * DIY Home Car Stereo 2-Way Speaker Box Terminal Binding Post Round Spring Cup Connectors Subwoofer Plugs (Black)