The high-quality plating process eliminates the possibility of corrosion to maintain the highest possible signal transfer and be professional and attractive. The binding posts can be used with banana plugs from the back or side. Will also accept bare wire up to 8 gauge with large diameter knurled heads to allow positive finger-tight connections. The rear bolt facilitates mounting in speaker cabinets with walls up to 25.4mm thick (9.5mm minimum thickness). Overall length is 57.2mm. Sold packaged in pairs, one Red and one Black.