1Designed for Diy: Speaker subwoofer box terminal cup works with banana plugs, or bare wires. Perfect for use in the home, hotel, hall or wherever you want to set up your speakers. 2Durable Construction: The speaker box is made of Abs plastic and zinc alloy and can be used for a long time. It has a good seal and won't damage your speakers. 3Easy Connection: This round terminal cup features dual binding post terminals for easy connection of speaker wires to speakers or subwoofer enclosures. 4Simple Installation: Metal contacts allow for optimal signal transmission and terminals ensure a secure connection. It's easy to install, screw locked, and easy to use. 5Dimensions: Round speaker terminal box. The outer diameter is 75mm/2.95in, the inner diameter is 48mm/1.89in, and the distance between the screw mounting holes is 43mm/1.69in.