QAD Ultra-Nok II. THE FIRST EVER METAL NOCKING LOOP. Provides the ultimate, evenly balanced, release point directly behind the arrow designed to be used with shallow engagement release aids; including caliber releases. Stops arrow from falling off string. Increases accuracy and consistency by improving arrow. Eliminates arrow pinching and bowstring wear. Unlike other metal nocking loops has four anti vibration screws to keep it from sliding up or down the string. Will maintain positive peep hole alignment shot after shot.