Set of 10 potentiometer control knobs with 4 mm shaft insert diameter and brass core, designed for replacement or upgrade of audio and electronic equipment potentiometers. Practical, durable, and easy to install for hobbyists and technicians. Key benefits Reliable fit: Designed for shafts with a 4 mm insert diameter to provide a secure, wobble connection for common potentiometer shafts. Durable construction: Brass core provides strength and longterm durability where repeated adjustment is required. Improved control: Knob profile offers a comfortable grip and stable rotation for precise tuning and volume adjustments. Ready for multiple repairs and projects: Ten identical knobs in one set reduce the need to source individual replacements. Features and attributes Function: Pushon control knobs for potentiometers, used to adjust resistance, volume, tone, or other parameters. Compatibility: Fits potentiometer shafts with a 4 mm insert diameter. Suitable for many audio devices, instruments, mixers, radios, and DIY electronics that use 4 mm shafts. Material: Brass core combined with a durable outer body for stable performance. Quantity: 10 pieces per pack for consistent appearance across panels and devices. Practical use scenarios Guitar amplifier or effects pedal : worn or missing knobs to restore consistent control over volume and tone settings. DIY audio projects and home electronics: Use the set when building or modifying mixers, preamps, synthesizers, or custom control panels that use 4 mm potentiometer shafts. Workshop and lab equipment maintenance: Swap old knobs on test gear and measurement instruments to improve tactile response and extend service life. What you get Ten control knobs, each with a 4 mm shaft insert diameter and brass core, ready for straightforward installation. Installation tips Ensure the potentiometer shaft diameter measures 4 mm before fitting. Align the knob with the shaft profile and push on firmly until seated. If a shaft has a set screw or specific spline, verify compatibility before installation. This set provides a practical, consistent solution for replacing or upgrading potentiometer knobs in audio equipment and electronic projects where a 4 mm shaft insert diameter is used.