About this item Specially Designed for DIY -- Terminal cup for speaker subwoofer boxes. Suitable for 4mm banana plugs, spade terminals or bare wire. Rear side requires spade connectors or direct soldering of a speaker wire. Suitable for using at home,in hotel,hall or the other places you want to set a speaker. Sturdy & Durable -- The speaker box is made of high quality and gold-plated metal., which can be used for a long time. It has good sealing effect and will not damage your speakers. Good sturdy product, easy to solder on the tabs, strong seeming polymer mounting plate. Easy to Connect -- This Facmogu round terminal cup features binding post terminals that make it easy to connect speaker wire to your speaker or subwoofer box. Rear connections use quick disconnect connectors. Positive (Red) and negative (Black) indicators to ensure proper wiring. Simply press down the terminals and insert speaker wire for direct contact. Easy to Install -- 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. With 4 mounting holes which make you mount easily. Pack & Size -- 2PCS 2-Way Round Speaker Terminal Box. Overall Diameter: 75mm / 2.95", Cutout Diameter: 47mm / 1.85", Top-mount depth: 20mm / 0.78". Please check the size before ordering. NOTE: Please allow slightly measuring deviation due to manual measurement.