guyker GKD502SP Locking Tuners, 3R+3L, 21:1 Gear Ratio, Black Gold

For guitars with modern 10 mm tuner holes, the guyker GKD502SP locking tuners provide a six-piece, 3R+3L replacement set in a black-and-gold finish.

The 21:1 gear ratio supports finer tuning adjustments than lower-ratio tuners. That added precision is useful when dialing in a pitch carefully, whether you are setting up a guitar or making a quick adjustment between songs.

A built-in string lock and anti-slip gear structure help keep strings secure and reduce tuning drift. The metal tuners are designed for guitars with the matching tuner-hole and mounting layout.

Technical overview

• Model: GKD502SP
• Type: Locking guitar tuning machines
• Configuration: 3R+3L, for six strings
• Gear ratio: 21:1
• Required tuner-hole diameter: 10 mm
• Mounting layout: 90-degree mounting hole
• Material: Metal
• Color: Black gold

The 3R+3L arrangement is intended for guitars with three tuners on each side of the headstock. For a suitable fit, the instrument should also have modern 10 mm tuner holes and the 90-degree mounting-hole layout. These fit details make the set a practical replacement for worn, tarnished, or aged tuning pegs when the guitar’s existing layout matches.

The 21:1 ratio offers a more precise adjustment approach than lower-ratio gearing, which can be helpful when making small pitch changes. The locking mechanism secures the strings at the tuners, while the anti-slip gear structure is designed to reduce tuning drift during play. Together, these features make the set relevant for players who want locking hardware and controlled tuning adjustments in one replacement set.

Tips for day-to-day use

During installation, match the tuner arrangement and mounting layout to the guitar’s headstock, and check the tuner-hole dimensions against the 10 mm requirement. Once installed, use the locking mechanism to hold each string securely at the tuner. The set is designed for compatible electric and acoustic guitars, while the 3R+3L layout specifically suits a three-per-side headstock. Checking the guitar’s existing tuner positions and mounting-hole direction before fitting helps ensure the replacement matches the instrument.

For a routine tuning adjustment, the 21:1 gearing lets you make finer changes than lower-ratio tuners. The locking design also helps keep strings from slipping at the tuning posts, while the anti-slip gear structure is intended to support more stable pitch. This combination is useful for players replacing older tuning pegs who want a locking setup without changing the guitar’s basic three-per-side arrangement.

Included in the package

The package contains six locking tuners in a 3R+3L configuration and the mounting hardware needed for installation. The matched set provides tuners for all six strings, with the correct right- and left-handed arrangement for a three-per-side headstock. Its black-and-gold finish gives the replacement hardware a coordinated look across the headstock.

Buying verdict

The guyker GKD502SP is suited to guitarists seeking a six-piece locking tuner replacement with a 21:1 ratio, provided the instrument matches its 10 mm tuner holes and 90-degree mounting layout. Choose it for the combination of finer tuning adjustments, string locking, and an anti-slip gear structure in a black-and-gold 3R+3L set. It brings those practical tuning features to compatible electric or acoustic guitars while preserving the familiar three-tuners-per-side configuration.