Music Nomad's patent pending Acousti-Lok is a strap lock adapter that adds the safety & flexibility of using strap locks to your TAYLOR acoustic guitar without permanently modifying it. Designed to be used with SCHALLER style strap locks (not included), Acousti-Lok's strong solid brass keyhole ring construction gives you the security you have been looking for. Will not fit TAYLOR Guitars original AA battery powered EXPRESSION SYSTEM.