These heavy-duty binding posts were designed with the audiophile in mind. The high-quality plating process eliminates the possibility of corrosion to maintain the highest possible signal transfer and resist harsh environmental conditions. The binding posts can be used with banana plugs or will accept wire up to 8 gauge. The large diameter knurled head allows for positive finger tight connections. Extra long rear bolt (1-1/2") for mounting in speaker cabinets with walls up to 1" thick. To install, simply drill a 1/4" hole and gently tap the binding post in place. The knurled shaft will keep the post from turning and creates an air-tight fit. Overall length is 2-1/4". Sold in color-coded pairs with solder tabs.