Grover 502G Roto-Grip Locking Rotomatic, Gold Machine Head Go to amazon.com Related posts Top 12 best locking tuners gold 2022 Feature3 Treble and 3 Bass set of 6. Perfect replacement for most standard machine heads.A thumb screw mechanism locks the string into placeIncludes all mounting hardware DescriptionRoto-Grip Locking Rotomatic Gold machine head