The Hipshot Grip-Lock is proven to hold strings tightly, allowing the guitar to stay in tune to improve playing enjoyment. The Grip-Lock is a mechanical type locking system that can be used on any guitar, including non-trem or acoustic.  Upgrade your tuners and improve the tuning accuracy and stability of your 6 In line headstock guitar with Hipshot's Tuner Upgrade Kit. With the patent pending UMP™(Universal Mount Plate) included free in this kit, tuners will retrofit on most guitars without drilling or screwing.

Features: 

• 6 Hipshot GRIP-LOCK tuners
• Reach nuts
• Washers
• Free UMP™ Kit
• Screws also included in case your guitar is not compatible with the UMP™.
• Made in USA