Equip your electronic devices with the DELTRON 15mm Series Collet Knob, a professional-grade control solution engineered for reliability and precision. This knob features a classic "fluted" vertical rib design, offering exceptional grip for detailed adjustments on mixing consoles, test instruments, and industrial control panels. Industrial Strength & Security Unlike standard push-on knobs that can loosen over time, the DELTRON knob utilizes a superior collet fixing system. A top-accessible slotted screw drives a nickel-plated brass collet, which grips the 6.35mm(1/4 inch) rotary shaft firmly from all sides. We have upgraded this model with an extra internal washer to reinforce the assembly, providing maximum structural integrity and preventing the "play" or wobble often found in cheaper alternatives. Built to Last The body is molded from tough, industrial-grade ABS plastic, resistant to impact and wear. The internal brass components are nickel-plated to prevent corrosion, ensuring the mechanism remains smooth and effective for years. Whether you are upgrading vintage audio gear or building new electronic projects, this knob delivers professional performance.