The D'Addario multi-tool provides the tools needed for most standard adjustments on your guitar and bass. The multi-tool features us and metric-sized keys made of long-lasting, heat-treated S2 steel in a compact design. At home, in the studio, or on the road, D'Addario has the tools to keep you and your instrument playing their best. D'Addario is known for innovative, problem-solving, quality musical accessories offering a complete line of award-winning accessories including cables, picks, tuners, capos, straps, humidifiers, maintenance tools and more.