See what I did there? Its a reducer, it works as it should. Nice thick plastic that should last forever if taken care of properly. I clamped one of those adjustable slinky-looking tubes to the bottom of my table saw and this reducer actually friction fit perfectly in the other end of the tube. Now the reducer sits perfectly out the side of my table saw for easy attaching/removing of the main duct collection hose I switch between various tools. A great purchase if you require its services.