500 Series Tuners Aluminum Shaft Bass Side set of 4

Direct replacement for many American Standard, Mexican and Korean basses. 

JENZ Precision Machine Head feature: 

* Retro Fit Existing Basses*

* Keep The Standard Look*

* No Wrench’s or adjustable parts*

* Stabilize the headstock*

* Remove the need for a string tree*

* Remove the string over string wrap*

* Secure the string to the post*

* Improve tuning stability*

* Reduce the tension from the headstock*

* Improve the Low strings from flopping*

* Decrease the tension on the truss rod*

* Improve dead spot issues*

* Set the string to any location on the Post*

* Light weight or standard weight for balance*

* Improve the overall response of the bass*