Set of four blue aluminum potentiometer control knobs designed for electric guitars and basses. Precision CNC machining produces a lightweight, durable knob with a smooth, flawless finish and no burrs or sharp edges. Key benefits Durable allaluminum construction for stable feel and long service life. Precise fit for standard 1/4 inch shafts (fit for shaft hole dia. 6 mm / 0.23 in). Integrated indicator line for quick visual reference of knob position. Secure mounting using the included set screw; small wrench provided for tightening and for fine adjustment of the shaft hole fit. Clean machined finish with no plastic inserts, improving contact and aesthetics. Features and specifications Quantity: 4 pieces, color: blue. Material: full aluminum, lightweight and solid feel. Mounting: set screw type for reliable attachment. Inner diameter compatibility: 1/4 inch nominal (specified fit for 6 mm / 0.23 in shaft). Size: 25 x 15.5 mm (diameter x height) confirm this matches your application before installation. Manufacturing: CNC machined for consistent dimensions and smooth edges. Finish: polished surface without burrs or sharp edges. Typical applications Replacement knobs for Tele and Telecaster style guitars when original knobs are worn or damaged. Upgrading the controls on electric basses or other electric guitars to match a blue color scheme. Custom guitar builds and projects where a reliable, metal knob with a clean visual indicator is required. Installation notes Slide the knob onto the potentiometer shaft, align the indicator, then tighten the set screw with the included wrench. If needed, use the small wrench to make fine adjustments to the shaft hole fit for a snug installation. Confirm shaft diameter and knob dimensions before fitting to ensure compatibility. Package contents 4 blue aluminum potentiometer knobs. 1 small wrench for set screw tightening and fit adjustment. These knobs provide a durable, precise, and visually consistent control option for a wide range of electric guitars and basses.