The D’Addario Planet Waves Acoustic CinchFit is the fast and easy way to attach your strap to most acoustic guitars with endpin output jacks. Endpin jacks are notorious for creating hassles when applying and removing standard guitar straps, and usually require modification to the strap which results in a less-than-desirable fit. The Acoustic CinchFit loops through the end of any instrument strap and its cinch clamping action allows easy application and removal, utilizing the weight of the instrument to remain locked onto the endpin so your guitar is always held securel