The only metal nocking loop that extends to fit ALL release aids and has adjustable back plates to fit all arrow nocks. Unlike other metal nocking loops will not un-nock your arrow or dislodge arrow at let down. Will eliminate bowstring wear as well as align your peep sight. Has FOUR anti-vibration screws, not two, to keep the Ultra-Nok XL securely on your string without sliding, maintaining accuracy shot after shot!

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