Fits All Models of MARTIN® Guitars except DSS-2018, OMSS-2019, Modern Deluxe Series. Ball End Design with Durable Steel Construction. Ergonomic Handle for Extra Length, Comfort and Control. Laser Etched 5mm Size in Metal so Always Know the Size Working With. MARTIN® and all other third party brand names are trademarks of their respective owners. Music Nomad LLC is not affiliated with those owners, nor claims ownership of those marks..