Dunlop Staploks adapt to your instrument by replacing existing strap pins/screws with special Straplok System buttons/screws. Two strap attachments are also included for your strap. The Dual Design model has a wider flange button providing extra security when using additional straps not fitted with a lock. Tools and tricks of the trade! From the garage to the arena - - players, luthiers, and techs prefer Dunlop accessories. Live to Play Live.