Unlike other strap lock systems, loxx combines great design with outstanding instrument protection. this unique, german engineered design with its inner spring and high-grade materials keeps your instrument safe while retaining its ease of use - even under the most extreme conditions. No more struggling to fit a lock to your strap. no more nuts and washers falling on stage halfway through the performance. loxx has a one handed "easy on - easy off" engage and release action, yet can resist a pull-out force of over 220 lbs. loxx strap lock system is rust proof, and offer (3) year warranty. this, combined with its ability to cover a broad range of strap sizes and thickness, makes it the most advanced and effective strap lock design available. The loxx strap lock system is complete with multi- purpose tool included, and is available in a number of different finishes, with a version for electric and bass guitar and another version for acoustic guitars. Package includes mounting screws and mini spanner. Suitable for electric guitar and bass. acoustic also version available