Set of four bass guitar machine heads tuning pegs designed for straightforward replacement or upgrade of your instrument tuning hardware. Provides reliable string control and consistent tuning behavior for studio and stage use. Key benefits Restore tuning stability: Replacing worn or loose tuners quickly improves how well your bass holds pitch during play. More reliable winding: Knobs and shafts give predictable string winding for faster, neater tuning and fewer slipbacks. Simple swapin upgrade: Designed as a directreplacement style set for common 4piece bass headstocks, so installation is quick and requires standard tools. Compact and durable design: Built to withstand regular playing and handling without adding bulk to the headstock. What this product does Function: Controls string tension and pitch by providing mechanical winding and locking of each string. Pack size: Includes four individual machine heads enough for a single bass guitar headstock. Compatibility: Intended for bass guitars with standard fourinline tuner layouts and common mounting hole patterns. Suitable for many electric and acoustic bass models that accept 4piece tuner sets. Performance: Provides consistent tuning action and improved repeatability compared to worn or damaged tuners. Practical attributes Easy installation: old tuners by removing the existing units, positioning each tuner in the original holes, and securing with the instrument hardware. Typical installation uses standard small screwdrivers and wrenches. Straightforward maintenance: Routine checks and light lubrication of moving parts keep the tuners performing well over time. Low profile: Designed to match typical headstock layouts without interfering with string winding or hand clearance. Use scenarios a bass after a tuner failure during rehearsal by swapping out the malfunctioning machine head set quickly to get back to playing. Upgrade an older instrument where the original tuners have excessive play or slipping, improving tuning reliability for recording sessions. Keep a set in your gig bag for emergency onstage repairs, providing a fast replacement option when time and tools are limited. What to check before Confirm your bass uses a 4inline tuner configuration and that the mounting hole spacing matches your headstock pattern. Verify whether your instrument uses separate bushings or washers so you can reuse existing hardware if applicable. This 4piece set is a practical, nononsense solution for maintaining tuning control on bass guitars, making replacements and upgrades simple and effective without altering your instrument setup.