Use the Hipshot GB7 Bass Xtender with a flick of its lever to drop-tune your Gotoh tuner-equipped bass. It makes your bass tunable from E to Low C. Installation instructions and mounting hardware included. Retrofits basses equipped with Gotoh GB7 tuning machines (used on many Ibanez, Yamaha, Epiphone, Peavey, Modulus, Schecter, and Warwick basses).