Exact Match for Intermatic Timers: The 146MT574 timer knob is precisely engineered as a direct replacement for Intermatic FD series timers. This knob ensures seamless compatibility with models like FD5MW, FD15MWC, and more, including older parts 146MT575 and 146MT563A. Versatile Application: Ideal for a wide range of uses, these knobs perfectly adjust settings on ceiling heating fans, heat lamps, exhaust fans, and other devices. They are essential for managing energy consumption in both residential and commercial settings. Optimal Size and Design: Each knob features an outer diameter of 1 inch and a D-shaped shaft of 3/16 inch, ensuring a snug fit for your timer. The pack includes six white knobs, crafted to blend seamlessly with existing fixtures. Durable Construction: Made from high-quality, fireproof plastic, these replacement knobs are built to last. Their sturdy design not only enhances durability but also ensures safety by preventing fire hazards associated with inferior materials. Universal Compatibility: Not only are these knobs suitable for Intermatic's FD series, but they also fit various Woods brand wall timers. This universal compatibility makes them a reliable choice for nearly any timer replacement needs. Color: White Material: plastic Package Contents: 6*Timer Switch Knob Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.