This 1.5" counterweight shaft extension is 7" long with a 1.5" diameter. It weighs 3 lbs and can hold up to 2 additional counterweights! You'll notice that the extension provides a longer counterweight balance arm and more total counterweight capacity. It features 1.5" 20 TPI male threads at one end, female at the other.
The counterweight shaft extension bar is compatible with the following counterweight shafts: