I installed these on both basses. If you don't have this, it is because you don't know about it, or you don't play guitar or bass. Once you have these installed, you are going to feel confident that your instrument is not going to slip out of the strap if you lean the wrong way. This is because you have to press the button to place the strap on the guitar, and when you release the button, it's locked in place. You repeat the process to remove the strap, which you can now use on another guitar or bass that has the system.