The RUPES iBrid Nano Rotary Function Unit provides you with greater versatility when you polish using your iBrid BigFoot polisher. With a simple swap, your iBrid Long Neck or iBrid Short Neck DA Polisher becomes a rotary machine with greater correction capabilities. The RUPES iBrid Nano Rotary Function Unit is a genuine replacement piece identical to the one that came in your iBrid kit. Pick up an extra to keep on hand in case yours gets lost or damaged