The Vulcan Hart 00-824277 Indicator Knob works by enabling it to be turned to a certain setting, and it acts as a visual guide to the appliance adjustments. It rotates around the control shaft in a smooth motion to specify the position selected. The knob is fitted to the control panel of compatible cooking equipment, and it fits directly on the panel, firmly in place. Its small size i... https://partsfe.com/indicator-knob-for-vulcan-part-00-824277