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, fits all M9 x .75 metric thread jacks. Compatible With L.R. Baggs® pickup output jacks. Not designed to be used on recessed or flush mount jacks.