The Dunlop Dual Design Straplok System Nickel has been release tested up to 800 lbs! The 360ยบ groove and ball design allows the unit to rotate without catching. The case hardened steel skin guarantees long life. The same strap can be used with several guitars, as the strap button is interchangeable. The Dunlop Dual Design Straplok System Nickel features a wider flange button that provides extra security. Part # SLS1031N