ITEM NAME:2pcs Square Copper Speaker Box Terminal Binding Post for Speaker Parts 57x5 Z7B6 2pcs Square Copper Speaker Box Terminal Binding Post for Speaker Parts 57x5 Z7B6 Size:57mm*57mm Install Hole Diameter:49mm Colour:Black size:57x57x30mm material:plastic + metal The high-grade copper terminals, small contact resistance, beautiful appearance, corrosion resistance and oxidation Package Contents:2 pcs x Music junction box Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm..Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing.