The Dunlop Straplok System is the strap retainer designed with the artist in mind. Its 360º groove and ball design allows the unit#to rotate without catching. Case-hardened steel skin guarantees long life. Interchangeable strap buttons allow the same strap tobe used with several guitars. Release-tested up to 360 kg of pull, Dunlop Straplok buttons will not come loose under normal playing conditions.