This high end speaker post has a 4mm hole at top of captive knob for connection via 4mm banana plugs and generous 8mm diameter cross hole for bare wire connection or spade terminals .When using bare cable the unique "Clamp Down" feature ensures that when bare cable conductors are used to make a connection via the cross hole the conductors are not twisted or damaged unlike similar products currently on the market.Available with both Red & Black Polarity bands and complete with built panel isolation kit and 2 fixing nuts and washer. This product is fully touchproof and meets both UL and CE safety norms. The brass body is silver plated