The Dunlop Black Straplok® System brand Strap Retainer System is designed with the artist in mind. 360° groove and ball design allows the unit to rotate without catching. The strap retainers are easy to install and operate. The case hardened steel skin guarantees long life. The same strap can be used with several guitars, as the strap button is interchangeable. Release tested up to 800 lbs. of pull. It will not come loose. Complete set (2 units for instrument and strap) adapts to instrument by replacing existing strap pins & screws with special Straplok® System brand buttons & screws. Two strap attachments are included for your strap. Each Dunlop Strap Lock set comes blister packaged