Are you spending half your time tuning and the other half playing out of tune? It could be your hardware. The Hipshot Tuner Upgrade Kit for 3+3 headstocks is a risk-free way to increase your guitar's stability and get back to playing (in tune)! The UMP (Universal Mount Plate) makes installation a snap. No special tools are required, and you can revert your guitar back to original with no evidence that you ever upgraded. All tuning machines are .827" [21mm] post length. Included UMP (Universal Mount Plate) for 3+3 headstocks fits guitars with 3 tuners on a side. No drilling or special tools required Includes HS buttons 18:1gear ratio Grip-Lock option uses a pin and thumb wheel system to clamp onto your string, no wraps needed String post hole fits strings up to .060" CHROME Distributed by Hipshot #6K2GL0C