Give your guitar a killer look and improve your tuning stability at the same time with the Hipshot® Tuner Upgrade Kit for 6 Inline headstocks. Whether you want the extra security of Grip-Lock™ tuners or the buttoned-up aesthetic of classic machines, the UMP™ (Universal Mount Plate) allows you to upgrade with no drilling or special tools. Plus, reverting back can be done with no evidence you ever upgraded.