The D'Addario Auto Lock Guitar Strap is a simple integrative strap locking system built for your performance. The latch is spring-loaded, so it automatically clamps down on the strap button and will not release unless desired. The D'Addario Auto Lock Guitar Strap works with most strap buttons on the market. Designed for players of all genres. • MFSKU 50BAL04 • UPC 019954307288