The Dunlop Straplok System Dual Design strap retainer uses a 360-degree groove-and-ball design to allow freedom of movement for your strap - without fear of catching or releasing. The Dunlop Straplok System Dual Design features case-hardened steel skin for long life, and you can use the same strap with several guitars because the strap button is interchangeable. Don't worry about this system being able to take your onstage abuse; it's tested at up to 800 lbs. of pull! Do yourself and your guitar a favor and install the Dunlop Straplok System Dual Design for peace of mind onstage!