The item is a set of 3pcs professional and practical 2-way speaker terminal screwer 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 locking and easy to use. Features - 3 pieces of the speaker terminal round spring cup connectors in one set will be sold together.- Color: mainly black.- 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").- 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 locking and easy to use.- Suitable for 4mm banana plugs, spade terminals or bare wire.- Compact, reliable and durable.Packing list: 3 * DIY Home Car Stereo 2-Way Speaker Box Terminal Binding Post Screw Connectors Subwoofer Plugs (Black)