The Grover name has been associated with quality guitar parts since the late 1800's. Originating in Cleveland, Ohio, among their first products were banjo and guitar machine heads, or tuning keys or pegs.
A mainstay of some of the biggest American guitar brands like Gibson Guitars and Martin Guitars, their machine heads are original parts on many guitar, and available as an aftermarket upgrade.
Grover make famous machine head types like Rotomatics, which are found on Gibsons and acoustic guitars, Vintage, found on Fender electric guitars, and the relatively modern Locking tuners.
Grover's are undoubtedly the world's best guitar tuning keys, the build quality and engineering is incredible, they never fail, and will keep your guitar solidly in tune.