You can finally let go! Music Nomad's patent pending Acousti-Lok is a strap lock adapter that adds the safety & flexibility of using strap locks to your acoustic guitar without permanently modifying it. Designed to be used with Schaller® style straplocks (not included), Acousti-Lok's strong solid brass construction gives you the security you've been looking for. Black finish. Specifically Designed for Taylor® Guitars with a 9 Volt Expression System® battery box. Note: will not fit Taylor® Guitars original AA battery powered Expression System®. Click here for Schaller Straplocks.