The Hipshot BT8 Bass Extender Key helps you strike the low end on your electric bass with confidence. The key fits 2008 and newer Fender American Standard Precision and Jazz Bass 4-string models. Now you only need one bass on the stage to tackle complex drop tunings, as these keys unlock ultra-precise bass tone. Installation is a snap, and once the Hipshot bass extender key is in, you're ready to go.