Electro-Acoustic Guitar Strap Adapter, Fits All 3/8" x 32 Thread Jacks, Designed To Work With Schaller-Style Strap Buttons But Easily Convertible To Other Brands Straps Or Non-Locking Straps, As Option You Can Not Use Shoulder Straps locking strap and use our strap button for easy strapping on and off, made of strong solid brass, finished in black, compatible with most Martin® Guitars with Fishman electronics, Taylor guitars up to 2002, Switchcraft output connectors , K&K Sound® Pure Mini & Pure Classic.