Product details:

Hipshot- BT1 Detuner(Gold)- Bass Side Instant, No Drill InstallationSince the days of Beethoven, "E" string devices have been used to extend the range of the upright string bass offering the instrument greater versatility. Bass Extender Key brings this proven versatility to the modern electric bass! With a quick flick of the handy thumb lever, the HIPSHOT Bass Extender Key instantly expands your range without leaving position. Tunable to any note from "E" to low "C" BT1 - G&L, Gibson Victory, Music Man, older Ibanez (4-in-line open gear), and Mexican made Fenders. Package Includes: 1 BT1 Detuner(Gold)Bass Side Installation instructions and mounting hardware