Upgrade your electronic equipment with the DELTRON 28mm Collet Knob, a professional-grade rotary control solution designed for precision and longevity. Unlike traditional push-on or set-screw knobs, this premium accessory utilizes a proven collet fixing system. As you tighten the top nut, the internal brass collet contracts evenly around the potentiometer shaft, creating a rock-solid, vibration-proof connection that will not slip or loosen. Engineered for Professionals Crafted from industrial-grade ABS, this knob offers a tactile, ergonomic grip suitable for sensitive adjustments. The internal mechanism is machined from nickel-plated brass, ensuring smooth operation and resistance to environmental factors. We have reinforced this model with an extra washer to handle higher torque and provide a confident feel during rotation. Versatile Application Ideal for a wide range of applications, including hi-fi audio amplifiers, studio mixers, laboratory power supplies, and industrial automation panels. The integrated indicator line allows for precise level setting, while the included cap hides the collet nut to protect the mechanism and provide a sleek, streamlined appearance on your device interface.