After years of mutilating the ends of guitar straps to get them to fit on end pin jacks of acoustic electrics, this has solved the problem. It is easy to attach to straps and very easy to attach to the endpin jack. It fits and holds securely, especially once you plug in to the endpin jack, and then the 1/4" plug and cord would keep the guitar from falling even if the Cinch Fit Jack Lock failed. I use it on my Martin, a Bedell, a Guild and a Gibson without any issues. Wish this would have come out years ago!!!!