Compatibility -- 91538 Control Knob fits 3/8" diameter shaft These fit for Weber Summit Series Grills Made in 2012 and later. S-460, E-470, S-470, S-660, E-670, S-670, etc. 91538 Grill Knobs - This Gas Range knob is made of highly durable materials, High temperature resistance, light weight and easy installation have the advantages. The chrome plating process is more beautiful, which can effectively prevent corrosion and rust problems. Simple to Install - Without using any installation tools, it is a direct replacement part and fit like a glove, simply remove the original knob and replace it, they have given your stove new life! Product Specifications - Package includes 4 control knobs; Please pay attention to whether you are buying the model when ordering to avoid the incompatibility of your cooktop! Warm Tips - Place a small amount of lubricating oil to the control knob valve stem shaft prior to installation. If you have any question, please feel free to contact us. 91538 Control Knobs Compatible with Weber Summit 400/600 Grills Manufactured 2012 and Later, Fit for E-470, E-670, S-460, S-470, S-660, S-670, Lighted Control Knobs Set of 4