There were 3 Woks available over the years. The old ones were carbon steel and had tabs welded to them to sit on the edge of a 18 or 22 kettle. They were huge and awesome. Next they moved to the the stainless steel version above. You remove the cooking grate and sit the wok on the tabs that normally hold the grate. The current one is the cast iron one from above, and works with the cooking system grates. You remove the center section of the grate, and the wok sits down in what's left of the cooking grate.