Specifications: Color: Black Material: ABS Base + Copper Terminal Mounting Holes: 2 Base Plate Thickness: Approx. 3.8mm Screw Holes: Approx. 3.5mm Wiring Terminal Hole: Approx. 3.8mm Binding Post Diameter: Approx. 12mm Install Diameter: Approx. 48mm Size: Approx. 75 x 75 x 25mm / 3.0 x 3.0 x 1.0in Package Weight: 55g Package List: 1 x Speaker Terminal Box (Speaker is NOT included.) 1 x Screws Kit Designed for DIY: The terminal box with 2 mounting holes is designed for DIY applications, where a replacement of the original speaker board is required. Easy to Install: Simple installation, it is used to install on the backside of the speaker as an amplifier. Support direct wiring, Y fork, straight banana head and bent banana head. Pure Copper: Pure copper plated wiring terminal, beautiful and high quality, effectively avoid from corrosion and rustiness, has good sealing effect and will not damage the loudspeaker, which can be used for a long time. Wide Compatibility: Can be used to diameter below 5mm of cable, or Banana head plug, suitable for home, hotel, hall or the other places you want to set a speaker. 3.8mm Thicken Base Plate: 3.8MM thicken base plate for reducing the resonance of wire box. Good solid product, easy to weld on the label, solid compound mounting plate. Optimal signal transmission.