D'Addario Accessories Guitar/Bass Multi-Tool (Pw-Gbmt-01). 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. 10-In-1 multi-tool US and metric sizes featuring: 3 fractional hex keys (0.05, 1/8, 3/16) 4 metric hex keys (1.5mm, 2.5mm, 3mm, 4mm) 2 Phillips screwdriver