Knob Dimensions: Each knob measures 2-3/8 inches in diameter and fits a 5/16 inch diameter shaft. Part Compatibility: Replaces part numbers E-470, E-670, S-460, S-470, S-660, S-670, etc. Fits Weber Summit Series Grills made from 2012 onwards. Quality Assurance: Constructed from durable materials to ensure a reliable and long-lasting product. User-Friendly Installation: Easy to install without professional help. Helpful installation videos are available online. Installation Advice: For best results, apply a small amount of liquid soap to the valve stem before installation. Warranty: 2 YEAR WARRANTY! Contact us if you have any problem after use. 91538 gas control knobs 4 Pack