Cinchfit Acoustic Jack LockThe DAddario Acoustic Cinch Fit is the fast and easy way to attach your strap to 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 Cinch Fit loops through the end of any instrument strap and its cinch clamping action allows easy application and removal,