Knob Size: Each 91538 light control knob has a diameter of 2-3/8 inches, compatible with a 5/16 inch diameter shaft. Versatile Replacement: Replaces part numbers E-470, E-670, S-460, S-470, S-660, S-670, etc. Designed for Weber Summit Series Grills manufactured from 2012 onwards. Robust Design: Made from high-quality materials, ensuring durability and extended use. Effortless Installation: Installation is straightforward and can be done without professional assistance. Installation guidance can be found online. Helpful Tips: Apply a small amount of liquid soap to the control knob valve stem for easier installation. 91538 gas control knobs 6 Pack